Battery box and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery box and a battery pack, the battery box comprises a top cover assembly and a bottom shell assembly, the top cover assembly comprises a battery box top cover and a gluing bin lining, and the gluing bin lining is arranged in the battery box top cover; the battery box top cover is further provided with a glue injection hole and an exhaust hole which are communicated with an area defined by the upper glue bin lining, the bottom shell assembly comprises a battery box bottom shell, a lower glue bin lining, a heating piece and at least one partition plate, the lower glue bin lining is arranged in the battery box bottom shell, the battery box top cover is arranged on the battery box bottom shell in a covering mode, and the upper glue bin lining abuts against the lower glue bin lining. The glue filling bin is used for forming a glue filling bin for placing a battery cell module, the heating sheet is laid at the bottom of the glue filling bin, and the at least one partition plate is arranged in the glue filling bin and divides the glue filling bin into a space matched with the battery cell module. The glue filling bin is filled with the pouring sealant through the glue injection hole, so that when the heating piece is heated, surrounding type heating is achieved, the heating efficiency is improved, and the heating uniformity of the battery cell module is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery box and a battery pack. Background Art

[0002] The electrochemical reaction rate, energy efficiency, charge and discharge capacity, safety and life of lithium batteries are closely related to temperature. In low temperature environments, the viscosity of the electrolyte increases, and the resistance to charge transfer increases, resulting in a decrease in charging efficiency and available capacity, and may even cause overheating risks due to increased internal resistance. Therefore, maintaining lithium batteries within a suitable operating temperature range (usually about 20-40°C) is crucial to maintaining their optimal performance, extending their service life, and preventing safety issues such as thermal runaway.

[0003] Because the charging and discharging efficiency of lithium batteries is significantly reduced in low temperature environments, the available capacity is reduced, and even normal charging and discharging may not occur. Therefore, the commonly used method is to set a heating plate in the battery pack body to provide additional heat inside or around the lithium battery through the heating plate, thereby increasing the temperature of the lithium battery and improving the charging and discharging performance of the lithium battery under low temperature conditions.

[0004] However, when only the heating sheet is used to heat the lithium battery, on the one hand, the lithium battery heats up slowly when the external temperature is extremely low; on the other hand, because the heating sheet is usually placed at the bottom of the lithium battery, the heating of various parts of the lithium battery is uneven during heating. Utility Model Content

[0005] The utility model aims to provide a battery box and a battery pack with fast heating speed and uniform heating effect.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] In one aspect, a battery box is provided, the battery box being used to accommodate a battery cell module, the battery box comprising:

[0008] A top cover assembly, the top cover assembly comprising a battery box top cover and a glue bin liner, the glue bin liner being arranged in the battery box top cover, and the battery box top cover is also provided with a glue injection hole and an exhaust hole communicating with an area surrounded by the glue bin liner;

[0009] A bottom shell assembly, the bottom shell assembly includes a battery box bottom shell, a lower glue bin lining, a heating plate and at least one partition, the lower glue bin lining is arranged in the battery box bottom shell, the battery box top cover is arranged on the battery box bottom shell, and the upper glue bin lining is abutted against the lower glue bin lining to form a glue filling bin for placing the battery cell module, the heating plate is laid on the bottom of the glue filling bin, at least one partition is arranged in the glue filling bin, and the glue filling bin is separated into a space adapted to the battery cell module.

[0010] Optionally, the bottom shell assembly further includes a mounting box, which is connected to the inside of the battery box bottom shell and is located outside the lower glue bin lining, and is used to install a DCDC converter.

[0011] Optionally, the mounting box includes a box body, a connecting plate and heat dissipation fins, the box body and the heat dissipation fins are respectively connected to both sides of the connecting plate, a mounting long hole corresponding to the box body is opened on the bottom shell of the battery box, the box body passes through the mounting long hole and is inserted into the bottom shell of the battery box, and the connecting plate is connected to the outside of the bottom shell of the battery box.

[0012] Optionally, the battery box bottom shell is further provided with an avoidance gap at a position corresponding to the mounting long hole, and the heat dissipation fin is located at the avoidance gap.

[0013] Optionally, the bottom shell assembly further includes an inspection cover plate, on which a plurality of long heat dissipation holes are formed, and the inspection cover plate is arranged to cover the avoidance gap.

[0014] Optionally, the top cover assembly further includes a handle, and the handle is detachably connected to the battery box top cover.

[0015] Optionally, a placement groove is provided on the top cover of the battery box, and a plug-in protrusion is provided on the groove wall of the placement groove along the groove width direction, an installation gap is left between two opposite plug-in protrusions, and assembly holes are provided on both sides of the handle along the length direction, and the installation gap is used for the handle to plug the assembly hole with the plug-in protrusion.

[0016] Optionally, a wiring hole located outside the glue filling bin is opened on the top cover of the battery box.

[0017] Optionally, the top cover assembly further comprises a socket cover plate, on which a plug-in through hole communicating with the wiring hole is provided, and stoppers are provided around the plug-in through hole.

[0018] On the other hand, a battery pack is also provided, comprising a battery box as described in any one of the above items.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a battery box, which is provided with an upper glue bin lining in a top cover of the battery box and a lower glue bin lining in a bottom shell of the battery box, so that when the top cover of the battery box is connected to the bottom shell of the battery box, the upper glue bin lining is combined with the lower glue bin lining to form a glue filling bin for storing battery core modules, and the glue filling bin is filled with potting glue through a glue injection hole. The protective layer formed by the potting glue after curing can be used as a heat conduction medium to help evenly distribute internal heat, and can also be used as a thermal resistance material to limit heat diffusion at extreme temperatures, which helps to maintain the battery core module working within a suitable temperature range, so that the heating plate laid on the bottom of the glue filling bin can achieve surrounding heating through the potting glue when heating, thereby improving heating efficiency and ensuring uniform heating of the battery core module, and by arranging at least one partition in the glue filling bin, a space suitable for battery core modules of various sizes and specifications is constructed in the glue filling bin, while ensuring effective glue filling, reducing the amount of glue filling and reducing costs.

[0021] The utility model also provides a battery pack, which ensures that the battery module works within a suitable temperature range by applying the above-mentioned battery box, improves the performance in low temperature environment, and prolongs the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an assembly diagram of the battery box provided by the utility model;

[0023] Figure 2 It is a structural exploded diagram of the battery pack provided by the utility model;

[0024] Figure 3 It is a structural schematic diagram of a battery box top cover in a battery box provided by the utility model;

[0025] Figure 4 It is a schematic diagram of the connection between the battery box top cover and the glue bin lining in the battery box provided by the utility model;

[0026] Figure 5 It is a structural schematic diagram of a battery box bottom shell in a battery box provided by the utility model;

[0027] Figure 6 It is a schematic diagram of the connection between the battery box bottom shell and the lower glue bin lining in the battery box provided by the utility model;

[0028] Figure 7 It is a structural schematic diagram of the handle in the battery box provided by the utility model;

[0029] Figure 8 It is a three-dimensional structural schematic diagram of the socket cover plate in the battery box provided by the utility model;

[0030] Fig. 9It is a side view of the socket cover plate in the battery box provided by the utility model;

[0031] Fig.10 It is a structural schematic diagram of a heating plate in a battery box provided by the utility model;

[0032] Fig.11 It is a structural schematic diagram of the installation box in the battery box provided by the utility model;

[0033] Fig.12 The utility model is a structural schematic diagram of an inspection cover in a battery box.

[0034] In the figure:

[0035] 100. Battery cell module;

[0036] 1. Top cover assembly; 11. Battery box top cover; 111. Glue injection hole; 112. Exhaust hole; 113. Placement groove; 114. Plug-in protrusion; 115. Charging wiring hole; 116. Discharge wiring hole; 12. Glue upper bin lining; 13. Handle; 131. Assembly hole; 14. Socket cover; 141. Plug-in through hole; 142. Stopper;

[0037] 2. Bottom shell assembly; 21. Battery box bottom shell; 211. Plug-in groove; 212. Installation long hole; 213. Avoidance gap; 22. Lower glue bin lining; 23. Heating plate; 231. Positive and negative lead wires; 24. Installation box; 241. Box body; 242. Connecting plate; 243. Heat dissipation fins; 25. Inspection cover; 251. Heat dissipation long hole. DETAILED DESCRIPTION

[0038] The present invention is 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 the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0039] 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.

[0040] In the present utility model, 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.

[0041] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified 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 a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0042] The electrochemical reaction rate, energy efficiency, charge and discharge capacity, safety and life of lithium batteries are closely related to temperature. In low temperature environments, the viscosity of the electrolyte increases, and the resistance to charge transfer increases, resulting in a decrease in charging efficiency and available capacity, and may even cause overheating risks due to increased internal resistance. Therefore, maintaining lithium batteries within a suitable operating temperature range (usually about 20-40°C) is crucial to maintaining their optimal performance, extending their service life, and preventing safety issues such as thermal runaway.

[0043] Because the charging and discharging efficiency of lithium batteries is significantly reduced in low temperature environments, the available capacity is reduced, and even normal charging and discharging may not occur. Therefore, the commonly used method is to set a heating plate in the battery pack body to provide additional heat inside or around the lithium battery through the heating plate, thereby increasing the temperature of the lithium battery and improving the charging and discharging performance of the lithium battery under low temperature conditions.

[0044] However, when only the heating sheet is used to heat the lithium battery, on the one hand, the lithium battery heats up slowly when the external temperature is extremely low; on the other hand, because the heating sheet is usually placed at the bottom of the lithium battery, the heating of various parts of the lithium battery is uneven during heating.

[0045] Therefore, in order to improve the heating efficiency of the lithium battery and ensure the uniformity of the heating of various parts of the lithium battery during heating, this embodiment provides a battery box for accommodating the battery module.

[0046] like Figures 1 to 12As shown, the battery box includes a top cover assembly 1 and a bottom shell assembly 2, the top cover assembly 1 includes a battery box top cover 11 and an upper glue bin lining 12, the upper glue bin lining 12 is arranged in the battery box top cover 11, and the battery box top cover 11 is also provided with a glue injection hole 111 and an exhaust hole 112 connected to the area surrounded by the upper glue bin lining 12, the bottom shell assembly 2 includes a battery box bottom shell 21, a lower glue bin lining 22, a heating plate 23 and at least one partition, the lower glue bin lining 22 is arranged in the battery box bottom shell 21, the battery box top cover 11 is covered on the battery box bottom shell 21, and the upper glue bin lining 12 is abutted against the lower glue bin lining 22 to form a glue filling bin for placing the battery cell module 100, the heating plate 23 is laid on the bottom of the glue filling bin, and at least one partition is arranged in the glue filling bin to separate the glue filling bin into a space adapted to the battery cell module 100.

[0047] The battery box is provided with an upper glue bin lining 12 in the battery box top cover 11, and a lower glue bin lining 22 in the battery box bottom shell 21, so that when the battery box top cover 11 is connected to the battery box bottom shell 21, the upper glue bin lining 12 is combined with the lower glue bin lining 22 to form a glue bin for storing the battery cell module 100, and the glue bin is filled with potting glue through the glue injection hole 111. The protective layer formed by the potting glue after curing can be used as a heat conduction medium to help the internal heat be evenly distributed, and can also be used as a thermal resistance material to limit Heat diffusion under extreme temperatures helps to maintain the battery cell module 100 operating within an appropriate temperature range, so that the heating plate 23 laid on the bottom of the glue potting bin can achieve surround heating through the potting glue during heating, thereby improving heating efficiency and ensuring uniform heating of the battery cell module 100. In addition, by providing at least one partition in the glue potting bin, a space suitable for battery cell modules 100 of various sizes is constructed in the glue potting bin, thereby ensuring effective glue potting while reducing the amount of glue used and reducing costs.

[0048] In this embodiment, the number of partitions can be freely set according to needs, and in order to facilitate the installation and fixation of the partitions, a plug-in groove 211 is further provided on the battery box bottom shell 21, and the partition is plugged into the plug-in groove 211, so as to be installed and fixed on the battery box bottom shell 21. In order to realize the connection between the battery box top cover 11 and the battery box bottom shell 21, connecting through holes are provided at the four corners of the battery box top cover 11, and connecting threaded holes corresponding to the connecting through holes are provided on the battery box bottom shell 21, and the connection between the battery box top cover 11 and the battery box bottom shell 21 is realized by bolts.

[0049] In addition, Fig.10As shown, the heating plate 23 is an etched heating plate, and a predetermined heating circuit pattern is accurately engraved on the substrate through an etching process. The circuit is a continuously customized shape to achieve uniform heat distribution. The heating circuit pattern can be freely set according to needs, and in order to facilitate the fixed connection of the heating plate 23 to the bottom of the glue filling bin, the surface of the heating plate 23 is coated with backing glue, and positive and negative electrode lead wires 231 are provided on the heating plate 23.

[0050] Alternatively, if Figure 2 , Fig.11 As shown, the bottom shell assembly 2 also includes a mounting box 24, which is connected to the battery box bottom shell 21 and is located outside the lower glue bin lining 22. The mounting box 24 is used to install the DCDC converter. By arranging the mounting box 24 inside the battery box bottom shell 21 and outside the lower glue bin lining 22, the installation and fixation of the DCDC converter is facilitated.

[0051] In this embodiment, the DCDC converter converts a voltage level into another voltage level, and a large amount of heat is generated during the conversion process. If the heat is not effectively dissipated, the efficiency of the DCDC converter may be reduced, or even the components may be burned. Therefore, the installation box 24 is made of aluminum material, which has good thermal conductivity. The heat generated inside is quickly transferred to the surrounding air through the aluminum surface, thereby improving the heat dissipation effect of the DCDC converter. The installation box 24 is a shell structure with a single side opening, and a screw column is designed on the inner wall of the installation box 24, so that the DCDC converter is assembled in the installation box 24, and finally the DCDC converter is connected to the battery box bottom shell 21 through the installation box 24.

[0052] Furthermore, if Figure 5 , Fig.11 As shown, the installation box 24 includes a box body 241, a connecting plate 242 and a heat dissipation fin 243, the box body 241 and the heat dissipation fin 243 are respectively connected to the two sides of the connecting plate 242, and the battery box bottom shell 21 is provided with a mounting long hole 212 corresponding to the box body 241, the box body 241 passes through the mounting long hole 212, is inserted into the battery box bottom shell 21, and the connecting plate 242 is connected to the outside of the battery box bottom shell 21. By arranging the heat dissipation fin 243 at the bottom of the box body 241, the heat exchange area is increased, and the heat transferred from the DCDC converter to the box body 241 is quickly transferred to the surrounding air through the heat dissipation fin 243 located on the outside of the battery box bottom shell 21, thereby improving the heat dissipation efficiency of the DCDC converter.

[0053] In this embodiment, the number of the heat dissipation fins 243 can be freely set according to the size of the box body 241, wherein the shape of the heat dissipation fins 243 can also be freely set according to demand, for example, the heat dissipation fins 243 can be straight plates or wavy plates, etc. In this embodiment, the heat dissipation fins 243 are fixedly connected to the bottom of the box body 241 by welding.

[0054] Alternatively, if Figure 5 , Fig.11 As shown, the battery box bottom shell 21 is provided with an avoidance notch 213 at the position corresponding to the installation long hole 212, and the heat dissipation fin 243 is located at the avoidance notch 213. By providing the avoidance notch 213 on the battery box bottom shell 21, the contact area between the heat dissipation fin 243 and the outside is increased, the heat dissipation efficiency is improved, and at the same time, the heat dissipation fin 243 located on the outside of the battery box bottom shell 21 is ensured not to be too protruding, thereby ensuring the neatness of the structural appearance.

[0055] Furthermore, if Figure 5 , Fig.12 As shown, the bottom shell assembly 2 also includes an inspection cover 25, and a plurality of heat dissipation long holes 251 are provided on the inspection cover 25, and the inspection cover 25 is covered at the avoidance gap 213. By arranging the inspection cover 25 on the avoidance gap 213, the heat dissipation fins 243 located outside the battery box bottom shell 21 are protected to avoid damage to the heat dissipation fins 243 when bumping, and a plurality of heat dissipation long holes 251 are provided on the inspection cover 25, so as to ensure that the heat dissipation fins 243 can normally exchange heat with the outside air, and after removing the inspection cover 25, the installation box 24 can be pulled out from the battery box bottom shell 21, so as to facilitate the maintenance of the DCDC converter without disassembling the battery box, thereby improving the convenience of maintenance. In this embodiment, the inspection cover 25 is connected to the battery box bottom shell 21 by bolts.

[0056] Alternatively, if Figure 2 , Figure 7 As shown, the top cover assembly 1 also includes a handle 13, and the handle 13 is detachably connected to the battery box top cover 11. By providing the handle 13 on the battery box top cover 11, it is convenient for the operator to extract the battery box. In this embodiment, the handle 13 is made of rubber. Since the battery box after assembling the battery module 100 is heavy, the rubber material is soft, which can reduce the hand pressure during assembly, and the surface of the handle 13 is textured to prevent accidental slipping. In addition, the handle 13 is made of rubber material, which has good wear resistance and corrosion resistance, can be used in a variety of environments, has a long service life, a simple manufacturing process, and good insulation.

[0057] Furthermore, if Figure 2 , Figure 3 , Figure 7As shown, a placement groove 113 is provided on the battery box top cover 11, and a plug-in protrusion 114 is provided on the groove wall of the placement groove 113 along the groove width direction, and an installation gap is left between two opposite plug-in protrusions 114, and assembly holes 131 are provided on both sides of the handle 13 along the length direction, and the installation gap is used for the handle 13 to plug the assembly holes 131 with the plug-in protrusion 114. By plugging the assembly holes 131 with the plug-in protrusion 114, a detachable connection between the handle 13 and the battery box top cover 11 is achieved.

[0058] During actual installation, the handle 13 is squeezed to make it enter from the installation gap between the two plug-in protrusions 114 , and then the plug-in protrusions 114 and the assembly holes 131 are plugged in through the elastic rebound effect of the handle 13 .

[0059] Optionally, a wiring hole is provided on the top cover 11 of the battery box, which is located outside the glue filling chamber. By providing a wiring hole on the top cover 11 of the battery box, it is convenient to connect the charging and discharging female connector cables to the inside of the battery. In this embodiment, two wiring holes are provided, namely, a charging wiring hole 115 and a discharging wiring hole 116.

[0060] Furthermore, if Figure 2 , Figure 3 As shown, the top cover assembly 1 also includes a socket cover plate 14, which is provided with a plug-in through hole 141 connected to the wiring hole, and a stopper 142 is provided around the plug-in through hole 141. By providing the socket cover plate 14, it is convenient to connect with the charging female connector and the discharging female connector, and the stopper 142 is provided around the plug-in through hole 141 to ensure the sealing of the connection. In this embodiment, the socket cover plate 14 is connected to the battery box top cover 11 by bolts.

[0061] In this embodiment, a battery pack is also provided, which includes the above-mentioned battery box. By using the above-mentioned battery box, the battery pack ensures that the battery module 100 works within a suitable temperature range, improves the performance in low temperature environment, and prolongs the service life.

[0062] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery box, the battery box being used to accommodate a battery cell module (100), characterized in that: The battery box comprises: A top cover assembly (1), the top cover assembly (1) comprising a battery box top cover (11) and a glue chamber liner (12), the glue chamber liner (12) being arranged in the battery box top cover (11), and the battery box top cover (11) is also provided with a glue injection hole (111) and an exhaust hole (112) which are connected to an area surrounded by the glue chamber liner (12); A bottom shell assembly (2), the bottom shell assembly (2) comprising a battery box bottom shell (21), a lower glue bin lining (22), a heating plate (23) and at least one partition, the lower glue bin lining (22) being arranged in the battery box bottom shell (21), the battery box top cover (11) being arranged on the battery box bottom shell (21), and the upper glue bin lining (12) being in contact with the lower glue bin lining (22) to form a glue filling bin for placing the battery cell module (100), the heating plate (23) being laid at the bottom of the glue filling bin, and at least one partition being arranged in the glue filling bin to separate the glue filling bin into a space adapted to the battery cell module (100).

2. The battery box according to claim 1, characterized in that: The bottom shell assembly (2) further comprises an installation box (24), the installation box (24) being connected to the inside of the battery box bottom shell (21) and being located outside the lower glue bin lining (22), the installation box (24) being used for installing a DCDC converter.

3. The battery box according to claim 2, characterized in that: The installation box (24) comprises a box body (241), a connecting plate (242) and heat dissipation fins (243); the box body (241) and the heat dissipation fins (243) are respectively connected to two sides of the connecting plate (242); a mounting long hole (212) corresponding to the box body (241) is opened on the battery box bottom shell (21); the box body (241) passes through the mounting long hole (212) and is inserted into the battery box bottom shell (21); and the connecting plate (242) is connected to the outside of the battery box bottom shell (21).

4. The battery box according to claim 3, characterized in that: The battery box bottom shell (21) is also provided with an avoidance notch (213) at a position corresponding to the mounting long hole (212), and the heat dissipation fin (243) is located at the avoidance notch (213).

5. The battery box according to claim 4, characterized in that: The bottom shell assembly (2) further comprises an inspection cover plate (25), on which a plurality of long heat dissipation holes (251) are provided, and the inspection cover plate (25) is arranged to cover the avoidance notch (213).

6. The battery box according to claim 1, characterized in that: The top cover assembly (1) further comprises a handle (13), wherein the handle (13) is detachably connected to the battery box top cover (11).

7. The battery box according to claim 6, characterized in that: The battery box top cover (11) is provided with a placement groove (113), and a plug-in protrusion (114) is provided on the groove wall of the placement groove (113) along the groove width direction, and an installation gap is left between two opposite plug-in protrusions (114). The handle (13) is provided with assembly holes (131) on both sides along the length direction, and the installation gap is used for the handle (13) to plug the assembly holes (131) and the plug-in protrusion (114).

8. The battery box according to claim 1, characterized in that: The battery box top cover (11) is provided with a wiring hole located outside the glue filling bin.

9. The battery box according to claim 8, characterized in that: The top cover assembly (1) also includes a socket cover plate (14), the socket cover plate (14) is provided with a plug-in through hole (141) connected to the wiring hole, and stoppers (142) are provided around the plug-in through hole (141).

10. A battery pack, characterized in that: The battery pack comprises a battery box as described in any one of claims 1-9.

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