Power battery pack

Abstract

A power battery pack. The power battery pack comprises battery cells (1), an electronic control module (3), and a case assembly (2) consisting of a lower case (21) and a protective end cover (22), wherein the lower case (21) is provided with an accommodating groove (211); the protective end cover (22) is configured to close the accommodating groove (211); a potting structure (212) is further provided on the inner wall of the accommodating groove (211), and the potting structure (212) is filled with an insulating colloid (4), the failure temperature of which is lower than the thermal runaway temperature of the battery cells (1), with the insulating colloid (4) being configured to bond the protective end cover (22) to the lower case (21) and fix the battery cells (1); and the lower case (21) is further provided with a limiting groove (213) communicating with the potting structure (212), and a part of the electronic control module (3) is accommodated in the limiting groove (213).

Description

Power battery pack

[0001] This application claims priority to Chinese patent applications filed on October 14, 2024, with application numbers 202411434720.9 and 202422485499.1, the entire contents of which are incorporated herein by reference.

[0002] Technical Field

[0003] This application relates to the field of battery technology, for example, to a power battery pack.

[0004] Background Technology

[0005] New energy vehicles are receiving increasing attention from society. The cost of electric vehicles is a major concern for OEMs, battery manufacturers, and consumers. As a component with a significant proportion of the cost of electric vehicles, the reduction of battery pack costs plays a crucial role. Therefore, the market is increasingly demanding higher requirements for the energy density, internal space utilization, and safety of battery packs.

[0006] A vehicle battery pack typically includes multiple individual cells for power supply, an electronic control module for managing the multiple individual cells, and a battery pack housing for protection. The multiple individual cells and the electronic control module are all housed inside the battery pack housing.

[0007] Technical issues

[0008] On the one hand, due to factors such as vibration in the operating environment, vehicle battery packs typically incorporate numerous fasteners and seals to secure and insulate the individual cells and electronic control modules within the pack, ensuring safety and protection during use. This results in a large number of components, high manufacturing costs, and complex assembly processes. On the other hand, to prevent external impurities or moisture from entering the battery pack housing and corroding the individual cells and electronic control modules, the battery pack housing must possess excellent sealing properties. However, when a single cell experiences thermal runaway, the high-temperature, high-pressure gas that breaks through the cell's explosion-proof valve can circulate wildly within the battery pack housing, unable to escape, and can damage other individual cells and electronic control modules, resulting in poor protection and safety.

[0009] Technical solutions

[0010] This application provides a power battery pack, including:

[0011] Multiple individual battery cells;

[0012] The housing assembly includes a lower housing and a protective end cap. One side of the lower housing has a receiving groove that corresponds to and is independent of multiple individual cells. The protective end cap is located at the opening of the receiving groove to close the receiving groove, thereby forming a receiving cavity for accommodating individual cells along the axial direction. An encapsulation structure is provided on the inner wall of the receiving groove. The encapsulation structure is filled with an insulating adhesive whose failure temperature is lower than the thermal runaway temperature of the individual cell. The insulating adhesive is used to bond the protective end cap and the lower housing, as well as to fix the individual cells located in the receiving cavity. A limiting groove corresponding to the receiving cavity is provided on the side of the lower housing away from the protective end cap. The limiting groove is connected to the encapsulation structure.

[0013] The electronic control module is located on the lower housing, with a portion of it housed in a limiting groove. The electronic control module is configured to manage multiple individual battery cells.

[0014] Optionally, the glue-filling structure includes a glue-guiding groove, a glue-injection port, and a connecting port. The glue-guiding groove is located on the wall of the receiving groove, and the glue-injection port and the connecting port are both located within the limiting groove. The glue-injection port is configured to connect the limiting groove and the receiving cavity, and the connecting port is configured to connect the limiting groove and the glue-guiding groove.

[0015] Optionally, the protective end cap includes a sealing part and an abutting part integrally formed by injection molding. The abutting part is an annular protrusion formed by extending the surface of the sealing part in the direction close to the single cell. The sealing part is located at the opening of the receiving groove and closes the receiving groove. The abutting part is inserted into the receiving groove and abuts against the single cell. A glue chamber communicating with the glue guide groove is formed between the abutting part and the groove wall of the receiving groove. The insulating glue filled in the glue chamber is used to bond the sealing part to the lower box body.

[0016] Optionally, the glue-filling structure also includes an overflow groove, which is formed on the wall of the receiving tank and communicates with the glue container. The overflow groove and the glue-guiding groove are symmetrically distributed on the wall of the receiving tank.

[0017] Optionally, the protective end cap also includes an exhaust chamber and a weakening structure. The exhaust chamber is opened on the abutment portion, and an annular groove with a V-shaped or U-shaped cross section is opened in the area of ​​the closed portion surrounded by the exhaust chamber to form a weakening structure. The thickness of the weakening structure is less than the thickness of the portion of the closed portion excluding the area surrounded by the exhaust chamber.

[0018] Optionally, the protective end cap also includes multiple limiting portions configured as sealing overflow grooves and guiding grooves. The outer edge of the sealing portion extends in a direction away from the central axis to form multiple limiting portions evenly distributed on the outer edge of the sealing portion. The multiple limiting portions are accommodated in the corresponding overflow grooves and guiding grooves. A protective rounded corner is provided at the corner of the limiting portion on the side away from the sealing portion.

[0019] Optionally, the electronic control module includes a data acquisition board assembly and a battery management system (BMS) assembly. The BMS assembly is located on the upper surface of the lower housing. A portion of the data acquisition board assembly is integrated on the upper surface of the lower housing and electrically connected to the BMS assembly. Another portion of the data acquisition board assembly is housed in a limiting groove and electrically connected to the individual battery cell.

[0020] Optionally, the electronic control module also includes a temperature sensor. A mounting hole is provided on the side of the lower housing 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 hole and abuts against the individual battery cell.

[0021] Optionally, the enclosure assembly also includes an enclosure top cover, which is located on the side of the BMS assembly away from the lower enclosure. The lower enclosure has a mounting slot on the side facing the enclosure top cover, and the enclosure top cover has a plug-in protrusion on the side facing the lower enclosure, which is inserted into the mounting slot.

[0022] Optionally, the acquisition plate assembly and the lower housing are injection molded into a single structure.

[0023] Beneficial effects

[0024] This application provides a power battery pack. Firstly, by providing a potting structure on the inner wall of the receiving groove in the lower housing, and connecting this potting structure to a limiting groove for accommodating a portion of the electronic control module, the insulating colloid can be simultaneously filled into both the limiting groove and the receiving cavity through the potting structure during the injection of insulating colloid. This achieves simultaneous fixation and insulation sealing of the individual battery cells located in the receiving cavity and the portion of the electronic control module housed in the limiting groove. Compared to traditional battery packs, this reduces the number of components used for insulation and fixation, lowers manufacturing costs, simplifies assembly steps, and improves assembly efficiency. Secondly, the failure temperature of the insulating colloid is lower than the thermal runaway temperature of the individual battery cells. Furthermore, the insulating colloid bonds the lower housing and the protective end cap. Therefore, in the event of thermal runaway, the insulating colloid melts upon heating, reducing the bonding strength between the protective end cap and the lower housing. This allows the protective end cap to open under pressure, releasing high-temperature, high-pressure gas and providing pressure relief protection, thereby improving safety and protection.

[0025] Attached Figure Description

[0026] Figure 1 is an exploded view of the power battery pack provided in some implementations of this application;

[0027] Figure 2 is a structural assembly diagram of a power battery pack provided in some implementations of this application;

[0028] Figure 3 is a three-dimensional structural diagram of the lower housing of the power battery pack provided in some implementations of this application;

[0029] Figure 4 is a schematic diagram of the planar structure of the lower housing of the power battery pack provided in some implementations of this application;

[0030] Figure 5 is a schematic diagram of the connection structure between a single cell and insulating colloid in a power battery pack provided by some implementations of this application;

[0031] Figure 6 is a three-dimensional structural diagram of the protective end cap in the power battery pack provided by some implementations of this application;

[0032] Figure 7 is a plan sectional view of the protective end cap in a power battery pack provided by some implementations of this application;

[0033] Figure 8 is a partial structural diagram of a battery management system (BMS) assembly with an integrated temperature sensor in a power battery pack provided by some implementations of this application.

[0034] In the picture:

[0035] 1. Single cell battery;

[0036] 2. Cabinet assembly; 21. Lower cabinet; 211. Receiving groove; 212. Glue filling structure; 2121. Glue guide groove; 2122. Glue injection port; 2123. Connecting port; 2124. Glue overflow groove; 213. Limiting groove; 214. Mounting slot; 215. Mounting through hole; 22. Protective end cap; 221. Sealing part; 222. Abutting part; 223. Vent chamber; 224. Weakening structure; 225. Limiting part; 226. Protective rounded corner; 23. Cabinet top cover; 231. Insertion protrusion;

[0037] 3. Electronic control module; 31. Data acquisition board assembly; 311. Series-connected sensor; 312. BMS positive input sensor; 313. BMS positive output sensor; 314. BMS negative input sensor; 315. BMS negative output sensor; 32. BMS assembly; 33. Temperature sensor;

[0038] 4. Insulating colloid; 41. First limiting post; 42. Second limiting post; 43. Bottom rubber ring; 44. Fixing seal.

[0039] Embodiments of the present invention

[0040] To reduce manufacturing costs, simplify assembly processes, and improve safety and protection, this embodiment provides a power battery pack.

[0041] As shown in Figures 1 to 8, the power battery pack includes multiple individual batteries 1, a housing assembly 2, and an electronic control module 3. The housing assembly 2 includes a lower housing 21 and a protective end cap 22. One side of the lower housing 21 has a receiving groove 211 that corresponds one-to-one with and is independent of the multiple individual batteries 1. The protective end cap 22 is located at the opening of the receiving groove 211 to close the receiving groove 211, thereby forming a receiving cavity for accommodating the individual batteries 1 along the axial direction. An encapsulation structure 212 is also provided on the inner wall of the receiving groove 211. The encapsulation structure 212 contains... An insulating colloid 4 with a failure temperature lower than the thermal runaway temperature of a single cell 1 is filled. The insulating colloid 4 is used to bond the protective end cap 22 and the lower housing 21, as well as the single cell 1 located in the receiving cavity. The lower housing 21 is also provided with a limiting groove 213 corresponding to the receiving cavity on the side away from the protective end cap 22. The limiting groove 213 is connected to the potting structure 212. The electronic control module 3 is located on the lower housing 21, and a part of the electronic control module 3 is housed in the limiting groove 213. The electronic control module 3 is configured to manage multiple single cells 1.

[0042] This power battery pack, on the one hand, has a potting structure 212 on the inner wall of the receiving groove 211 of the lower housing 21, and the potting structure 212 is connected to the limiting groove 213 which is set to accommodate a part of the electronic control module 3. This allows the insulating adhesive 4 to be filled simultaneously into the limiting groove 213 and the receiving cavity through the potting structure 212 during the injection of the insulating adhesive 4. This achieves synchronous fixation and insulation sealing of the individual battery cells 1 located in the receiving cavity and the portion of the electronic control module 3 housed in the limiting groove 213. Compared with traditional battery packs, this reduces the amount of... The reduced number of insulating and fixed components lowers manufacturing costs, simplifies assembly processes, and improves assembly efficiency. Furthermore, the failure temperature of the insulating colloid 4 is lower than the thermal runaway temperature of the individual battery 1. The insulating colloid 4 bonds the lower housing 21 and the protective end cap 22. Therefore, in the event of thermal runaway, the insulating colloid 4 melts upon heating, reducing the bonding strength between the protective end cap 22 and the lower housing 21. This allows the protective end cap 22 to open under pressure, releasing high-temperature, high-pressure gas and providing pressure relief protection, thereby improving safety and protection. In this embodiment, the individual battery 1 in the power battery pack is a 12V large cylindrical battery.

[0043] Optionally, as shown in Figures 3, 4, and 5, the glue-filling structure 212 includes a glue-guiding groove 2121, a glue-injection port 2122, and a connecting port 2123. The glue-guiding groove 2121 is disposed on the wall of the receiving groove 211. The glue-injection port 2122 and the connecting port 2123 are both disposed within the limiting groove 213. The glue-injection port 2122 is configured to connect the limiting groove 213 and the receiving cavity, and the connecting port 2123 is configured to connect the limiting groove 213 and the glue-guiding groove 2121. By providing an injection port 2122 and a connecting port 2123 in the limiting groove 213, and providing a guide groove 2121 on the wall of the receiving groove 211 that connects to the limiting groove 213 through the connecting port 2123, when the insulating colloid 4 is injected, the insulating colloid 4 overflows into the limiting groove 213 after fixing and insulating the end of the single battery 1 through the injection port 2122. Then, it flows into the guide groove 2121 along the limiting groove 213 through the connecting port 2123. The guide groove 2121 guides the flow of the insulating colloid 4 inside the receiving cavity. On the other hand, after the injection is completed, the insulating colloid 4 solidifies in the limiting groove 213 to form a fixed seal 44, and the insulating colloid 4 solidifies in the guide groove 2121 to form a first limiting post 41, thereby limiting the single battery 1 placed in the receiving cavity and preventing the single battery 1 from moving in the receiving cavity. The number of adhesive guide grooves 2121 can be freely set according to requirements. In this embodiment, each receiving cavity is provided with two adhesive guide grooves 2121, and each adhesive guide groove 2121 is provided with a communication port 2123 that communicates with the limiting groove 213.

[0044] Optionally, as shown in Figures 6 and 7, the protective end cap 22 includes a sealing part 221 and an abutment part 222 integrally formed by injection molding. The abutment part 222 is an annular protrusion extending from the surface of the sealing part 221 in the direction close to the single cell 1. The sealing part 221 is located at the opening of the receiving groove 211 and closes the receiving groove 211. The abutment part 222 is inserted into the receiving groove 211 and abuts against the single cell 1. A glue chamber communicating with the glue guide groove 2121 is formed between the abutment part 222 and the groove wall of the receiving groove 211. The insulating glue 4 filled in the glue chamber is used to bond the sealing part 221 to the lower casing 21. By using the sealing part 221 and the abutment part 222 to form the protective end cap 22, the protective end cap 22 can seal the opening of the receiving groove 211 on the one hand, and limit and fix the single cell 1 through the abutment part 222, so as to prevent the single cell 1 from moving within the receiving groove 211. Meanwhile, by forming a glue tank that communicates with the glue guide groove 2121 between the contact part 222 and the groove wall of the receiving groove 211, the insulating glue 4 flows into the glue tank during glue filling. After solidification, it forms a bottom glue ring 43, which on the one hand connects and fixes the protective end cap 22 in the receiving groove 211, realizing the connection between the protective end cap 22 and the lower box 21, and on the other hand, it can also play the role of insulation protection and buffer protection.

[0045] Optionally, as shown in Figures 3, 4, and 5, the glue-filling structure 212 further includes an overflow groove 2124. The overflow groove 2124 is formed on the wall of the receiving groove 211 and communicates with the glue tank. The overflow groove 2124 and the guide groove 2121 are symmetrically distributed on the wall of the receiving groove 211. By forming the overflow groove 2124 on the side wall of the receiving groove 211 and communicating with the glue tank, the flow of the insulating glue 4 overflowing from the glue tank into the receiving cavity is guided. On the other hand, after the glue-filling is completed, the insulating glue 4 solidifies in the overflow groove 2124, forming a second limiting post 42, which cooperates with the first limiting post 41 formed by the insulating glue 4 solidifying in the guide groove 2121 to strengthen the limiting strength of the single battery 1 placed in the receiving cavity. The number of overflow grooves 2124 can be freely set according to needs. In this embodiment, the number of overflow grooves 2124 and the number of guide grooves 2121 are the same, both of which are provided in two.

[0046] In this embodiment, the overflow groove 2124 and the guide groove 2121 are symmetrically distributed on the wall of the receiving groove 211. By symmetrically distributing the overflow groove 2124 and the guide groove 2121 on the wall of the receiving groove 211, after the insulating adhesive 4 solidifies in the overflow groove 2124 to form the second limiting post 42, and after it solidifies in the guide groove 2121 to form the first limiting post 41, the first limiting post 41 and the second limiting post 42 are evenly distributed on the outside of the single cell 1, thereby ensuring the uniformity of the force on the single cell 1. Optionally, as shown in Figures 6 and 7, the protective end cap 22 further includes an exhaust cavity 223 and a weakening structure 224. The exhaust cavity 223 is formed on the abutment portion 222. The closed portion 221 has an annular groove with a V-shaped or U-shaped cross section in the area surrounded by the exhaust cavity 223 to form the weakening structure 224. The thickness of the weakening structure 224 is less than the thickness of the closed portion 221 excluding the area surrounded by the exhaust cavity 223.

[0047] By opening an exhaust chamber 223 on the contact portion 222, when a single cell 1 experiences thermal runaway, the exhaust chamber 223 guides the high-pressure, high-temperature gas escaping from the single cell 1. A weakened structure 224 with a thickness smaller than other parts of the protective end cover 22 is provided in the area enclosed by the exhaust chamber 223 in the sealed portion 221. This allows the high-pressure, high-temperature gas to be discharged into the external environment by breaking through the weaker structure 224, thus achieving a first-level depressurization and providing a first layer of protection. If the depressurization requirement is still not met at this point, as the temperature gradually rises, the high-pressure, high-temperature gas will melt the bottom rubber ring 43 located on the outside of the contact portion 222, causing a decrease in the strength of the connection between the protective end cover 22 and the lower casing 21. Thus, when the weakened structure 224 fails to meet the discharge requirement, the high-pressure, high-temperature gas can directly break through the protective end cover 22 for a second-level depressurization, thereby achieving a second layer of protection. This dual depressurization protection ensures the smooth discharge of high-pressure, high-temperature gas during thermal runaway, thereby improving the safety of the battery pack casing. In this embodiment, the weakening structure 224 is an annular groove formed on the closed portion 221.

[0048] In this embodiment, the groove depth of the weakening structure 224 can be freely set according to design requirements, and the cross-section of the annular groove weakening structure 224 adopts a V-shape or U-shape. By adopting an annular groove with a V-shape or U-shape, the annular groove has a tendency to gather high-temperature and high-pressure gas at the bottom of the groove, so that the high-temperature and high-pressure gas is more concentrated after entering the annular groove, which is more conducive to breaking through the weakening structure 224 and being discharged into the external environment.

[0049] Optionally, as shown in Figure 6, the protective end cap 22 further includes multiple limiting portions 225 configured as sealing overflow grooves 2124 and guiding grooves 2121. The outer edge of the sealing portion 221 extends in a direction away from the central axis to form multiple limiting portions 225 evenly distributed on the outer edge of the sealing portion 221. The multiple limiting portions 225 are accommodated in the corresponding overflow grooves 2124 and guiding grooves 2121. A protective rounded corner 226 is provided at the corner of the limiting portion 225 on the side away from the sealing portion 221. When the protective end cap 22 is connected to the lower housing 21, the limiting portions 225 increase the connection area between the protective end cap 22 and the lower housing 21, thereby ensuring the strength of the connection between the protective end cap 22 and the lower housing 21.

[0050] In this embodiment, the number of limiting portions 225 is consistent with the sum of the number of adhesive guide grooves 2121 and adhesive overflow grooves 2124. When the protective end cap 22 is connected to the lower housing 21, the limiting portions 225 can be embedded in the adhesive guide grooves 2121 and adhesive overflow grooves 2124 to achieve the limiting function of the protective end cap 22. The outer edge of the closing portion 221 extends in a direction away from the central axis to form the limiting portion 225, and a protective rounded corner 226 is provided at the corner of the limiting portion 225 away from the closing portion 221. By providing a protective rounded corner 226 at the corner of the limiting portion 225 away from the closing portion 221, it is avoided that the sharp end of the corner will damage the adhesive guide grooves 2121 and adhesive overflow grooves 2124 when the limiting portion 225 is accommodated in the adhesive guide grooves 2121 and adhesive overflow grooves 2124, thus affecting the sealing performance of the protective end cap 22 to the receiving groove 211.

[0051] The protective end cap 22 is integrally molded using injection molding, so as to simultaneously form the sealing part 221, the abutment part 222, the venting chamber 223, the weakening structure 224, the limiting part 225, and the protective rounded corner 226 that constitute the protective end cap 22.

[0052] Optionally, as shown in Figure 1, the electronic control module 3 includes a data acquisition board assembly 31 and a battery management system (BMS) assembly 32. The BMS assembly 32 is disposed on the upper surface of the lower housing 21. A portion of the data acquisition board assembly 31 is integrated on the upper surface of the lower housing 21 and electrically connected to the BMS assembly 32. Another portion of the data acquisition board assembly 31 is housed in a limiting groove 213 and electrically connected to the individual battery cell 1. By housing the data acquisition board assembly 31, which collects information from the individual battery cell 1, in the limiting groove 213, the position of the data acquisition board assembly 31 is fixed after glue injection, thereby preventing the data acquisition board assembly 31 from shifting due to external factors and thus avoiding the inability to accurately acquire information from the individual battery cell 1.

[0053] In this embodiment, the acquisition board assembly 31 includes a series connector 311, a BMS positive input connector 312, a BMS positive output connector 313, a BMS negative input connector 314, and a BMS negative output connector 315. The series connector 311 is configured to enable the conduction of multiple individual cells 1. The BMS positive input connector 312 and the BMS negative input connector 314 are both configured to connect the series connector 311 to the BMS assembly 32. Then, the BMS positive output connector 313 and the BMS negative output connector 315 connect the BMS assembly 32 to external devices. In addition, the acquisition board assembly 31 and the lower housing 21 are injection molded into a single structure. This allows the acquisition board assembly 31 and the lower housing 21 to be integrated into a single structure through the injection molding process, while simultaneously constructing a receiving groove 211, a limiting groove 213, and a potting structure 212 connecting the limiting groove 213 and the receiving cavity directly on the lower housing 21.

[0054] Optionally, as shown in Figures 1 and 8, the electronic control module 3 also includes a temperature sensor 33. A mounting through-hole 215 is provided on the side of the lower housing 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 215 and abuts against the individual battery cell 1. By integrating the temperature sensor 33 onto the BMS assembly 32 and having the other side of the temperature sensor 33 directly pass through the mounting through-hole 215 on the lower housing 21, the temperature of the individual battery cell 1 can be directly collected. This eliminates the need for connecting wiring harnesses, reduces connection costs, and minimizes space requirements, resulting in a more compact structure.

[0055] In this embodiment, thermally conductive structural adhesive is applied to the side of the temperature sensor 33 that contacts the single battery 1. This serves two purposes: firstly, it secures the temperature sensor 33 to the single battery 1; secondly, it allows the heat from the single battery 1 to be quickly transferred to the temperature sensor 33 via the thermally conductive structural adhesive.

[0056] Optionally, as shown in Figures 1 and 3, the enclosure assembly 2 also includes an enclosure top cover 23, which covers the side of the BMS assembly 32 opposite to the lower enclosure 21. The lower enclosure 21 has an installation slot 214 on the side facing the enclosure top cover 23, and the enclosure top cover 23 has an insertion protrusion 231 on the side facing the lower enclosure 21. The insertion protrusion 231 is inserted into the installation slot 214. On the one hand, by covering the side of the BMS assembly 32 away from the lower housing 21 with the housing cover 23, the BMS assembly 32 is protected and prevented from being exposed to the outside world and damaged. On the other hand, by opening an installation slot 214 on the lower housing 21 and setting a plug-in protrusion 231 on the housing cover 23, the lower housing 21 and the housing cover 23 can be easily assembled by plugging the plug-in protrusion 231 into the installation slot 214, and the connection between the lower housing 21 and the housing cover 23 can be made tighter, thus improving the sealing performance after the lower housing 21 and the housing cover 23 are connected.

Claims

1. A power battery pack, comprising: Multiple single-cell batteries (1); The housing assembly (2) includes a lower housing (21) and a protective end cap (22). One side of the lower housing (21) has a receiving groove (211) corresponding to and independent of each of the individual battery cells (1). The protective end cap (22) is positioned at the opening of the receiving groove (211) to close it, forming an axially oriented cavity for accommodating the individual battery cells (1). An encapsulation structure (212) is provided on the inner wall of the receiving groove (211). The potting structure (212) is filled with an insulating colloid (4) whose failure temperature is lower than the thermal runaway temperature of the single cell (1). The insulating colloid (4) is configured to bond the protective end cap (22) and the lower housing (21) and fix the single cell (1) located in the receiving cavity. The lower housing (21) has a limiting groove (213) on the side away from the protective end cap (22) that corresponds to the receiving cavity. The limiting groove (213) is connected to the potting structure (212). The electronic control module (3) is located on the lower housing (21), and a part of the electronic control module (3) is housed in the limiting groove (213). The electronic control module (3) is configured to manage multiple individual batteries (1).

2. The power battery pack of claim 1, wherein, The glue-filling structure (212) includes a glue-guiding groove (2121), a glue-injection port (2122), and a connecting port (2123). The glue-guiding groove (2121) is located on the wall of the receiving groove (211). The glue-injection port (2122) and the connecting port (2123) are both located in the limiting groove (213). The glue-injection port (2122) is configured to connect the limiting groove (213) and the receiving cavity. The connecting port (2123) is configured to connect the limiting groove (213) and the glue-guiding groove (2121).

3. The power battery pack of claim 2, wherein, The protective end cap (22) includes a closed part (221) and an abutting part (222) integrally formed by injection molding. The abutting part (222) is an annular protrusion formed on the surface of the closed part (221) extending in the direction close to the single cell (1). The closed part (221) is located at the opening of the receiving groove (211) and closes the receiving groove (211). The abutting part (222) is inserted into the receiving groove (211) and abuts against the single cell (1). A glue chamber is formed between the abutting part (222) and the groove wall of the receiving groove (211) and communicates with the glue guide groove (2121). The insulating glue (4) filled in the glue chamber is configured to bond the closed part (221) to the lower box (21).

4. The power battery pack of claim 3, wherein, The glue-filling structure (212) also includes an overflow groove (2124), which is opened on the wall of the receiving groove (211) and communicates with the glue tank. The overflow groove (2124) and the glue-guiding groove (2121) are symmetrically distributed on the wall of the receiving groove (211).

5. The power battery pack of claim 3, wherein, The protective end cap (22) also includes an exhaust chamber (223) and a weakening structure (224). The exhaust chamber (223) is formed on the abutment portion (222). The closed portion (221) has an annular groove with a V-shaped or U-shaped cross section in the area surrounded by the exhaust chamber (223) to form the weakening structure (224). The thickness of the weakening structure (224) is less than the thickness of the closed portion (221) excluding the area surrounded by the exhaust chamber (223).

6. The power battery pack of claim 4, wherein, The protective end cap (22) also includes a plurality of limiting portions (225) configured to close the overflow groove (2124) and the guide groove (2121). The outer edge of the closing portion (221) extends in a direction away from the central axis to form a plurality of the limiting portions (225) evenly distributed on the outer edge of the closing portion (221). The plurality of limiting portions (225) are accommodated in the corresponding overflow groove (2124) and the guide groove (2121). The corner of the limiting portion (225) on the side away from the closing portion (221) is provided with a protective rounded corner (226).

7. The power battery pack of claim 1, wherein, The electronic control module (3) includes a data acquisition board assembly (31) and a battery management system (BMS) assembly (32). The BMS assembly (32) is located on the upper surface of the lower housing (21). A part of the data acquisition board assembly (31) is integrated on the upper surface of the lower housing (21) and electrically connected to the BMS assembly (32). Another part of the data acquisition board assembly (31) is housed in the limiting groove (213) and electrically connected to the single battery cell (1).

8. The power battery pack of claim 7, wherein, The electronic control module (3) also includes a temperature sensor (33). The lower housing (21) has a mounting through hole (215) on the side 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 (215) and abuts against the single battery cell (1).

9. The power battery pack of claim 7, wherein, The enclosure assembly (2) also includes an enclosure top cover (23), which covers the side of the BMS assembly (32) away from the lower enclosure (21). The lower enclosure (21) has an installation slot (214) on the side facing the enclosure top cover (23), and the enclosure top cover (23) has an insertion protrusion (231) on the side facing the lower enclosure (21). The insertion protrusion (231) is inserted into the installation slot (214).

10. The power battery pack of claim 7, wherein, The acquisition plate assembly (31) and the lower housing (21) are injection molded into a single structure.

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