Battery pack

Abstract

The invention relates to the technical field of electric energy storage, and particularly discloses a battery pack which comprises a box body assembly provided with a battery bin, a battery module located in the battery bin, a heating assembly located in the battery bin and attached to the battery module, a circuit device located in the battery bin and a box cover assembly covering the battery bin. An anti-condensation block used for inhibiting water vapor from being condensed into condensate water is arranged at the position, located over the circuit device, of the bottom face of the box cover assembly. The battery pack provided by the invention can effectively solve the problem that the existing battery pack is easy to cause circuit failure due to dripping of condensed water.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy storage, and in particular to a battery pack. Background Art

[0002] Existing battery packs usually include a box assembly with a battery compartment, a battery module located in the battery compartment, a battery management system (BMS) located in the battery compartment, and a box cover assembly that covers the opening of the battery compartment. In order to improve the low-temperature performance of the battery pack, some manufacturers will add a heating assembly in the battery compartment. When the heating assembly is working, the temperature inside the battery pack rises. When the water vapor in the battery pack encounters the metal box cover assembly, it is easy to condense into condensed water on the bottom surface of the box cover assembly, and then drip down onto the BMS, causing circuit failures such as BMS short circuit.

[0003] Therefore, there is an urgent need to improve the existing battery pack to solve the problem that it is easy to cause circuit failure due to condensation water dripping.

[0004] The above information disclosed in this Background section is included only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is currently known to a person of ordinary skill in the art. Summary of the invention

[0005] An object of the present invention is to provide a battery pack that can effectively solve the problem that the existing battery pack is prone to circuit failure due to dripping of condensed water.

[0006] To achieve the above objectives, the present invention provides a battery pack, comprising a box assembly having a battery compartment, a battery module located in the battery compartment, a heating assembly located in the battery compartment and attached to the battery module, a circuit device located in the battery compartment, and a box cover assembly covering the battery compartment;

[0007] Wherein, the bottom surface of the box cover assembly is located directly above the circuit device and is provided with an anti-condensation block for inhibiting the condensation of water vapor into condensed water.

[0008] Optionally, the box cover assembly includes a box cover body and a protective molding that is fitted at an edge of the box cover body.

[0009] Optional,

[0010] Each top corner position of the top surface of the box cover body is provided with a top corner recessed portion recessed downward, a peripheral reinforcement portion protruding upward is provided between two adjacent top corner recessed portions, and a central reinforcement portion protruding upward is provided at the center position of the top surface of the box cover body;

[0011] Each of the peripheral reinforcement parts is connected to the central reinforcement part, and a water guide groove connected to the corresponding top corner recessed part is provided between two adjacent peripheral reinforcement parts.

[0012] Optionally, the box assembly includes:

[0013] A box body, wherein the box body is provided with a battery compartment with an opening facing upward;

[0014] A reinforcement frame assembly, wherein the reinforcement frame assembly is installed in the battery compartment;

[0015] The ear assembly is fixedly mounted on the outside of the box body.

[0016] Optionally, the reinforcement frame assembly includes a reinforcement frame that fits the four side walls of the battery compartment, a plurality of crossbeams connected to the reinforcement frame, and a longitudinal beam that is connected to the reinforcement frame and is perpendicular to each of the crossbeams;

[0017] Wherein, the battery module is placed on each of the beams.

[0018] Optionally, the box body includes two side surfaces that are arranged opposite to each other, one end of the two side surfaces is connected by a front end surface, and the other end of the two side surfaces is connected by a rear end surface, wherein the battery module is located in the battery compartment near the rear end surface, and the circuit device is located in the battery compartment near the front end surface;

[0019] The ear assembly includes a plurality of front ear fixedly mounted on the front end surface, a side front ear fixedly mounted on the side surface close to the front end surface, and a side rear ear fixedly mounted on the side surface close to the rear end surface;

[0020] Wherein, the side front lifting ear and the side rear lifting ear are both arranged corresponding to the top angle position of the battery module.

[0021] Optionally, the upper surfaces of the front end lifting ear, the side front lifting ear and the side rear lifting ear are all provided with a downwardly recessed reinforcement groove.

[0022] Optionally, the reinforcement grooves of the front end lifting ear and the side front lifting ear extend from top to bottom, and drainage holes are provided at the bottoms of the reinforcement grooves of the front end lifting ear and the side front lifting ear.

[0023] Optionally, the heating component includes a thermally conductive adhesive layer and a heating wire built into the thermally conductive adhesive layer.

[0024] Optionally, a supporting foam is provided under the heating component, and the thickness of the supporting foam after the battery module is placed in the battery module is 75%-85% of the thickness before the battery module is placed in the battery module.

[0025] The beneficial effect of the present invention is that: a battery pack is provided, an anti-clotting block is arranged directly above the circuit device, when the heating component is working and the temperature in the battery compartment rises, water vapor cannot condense into condensed water on the bottom surface of the anti-clotting block, thereby effectively preventing the condensed water from falling down to the circuit device and causing the circuit device to short-circuit.

[0026] Therefore, the battery pack provided by the present invention can effectively solve the problem that condensed water easily drips onto circuit components, causing short circuits in the circuit components. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 An exploded view of a battery pack provided in an embodiment;

[0029] Figure 2 A schematic diagram of the bottom surface of a box cover assembly provided in an embodiment;

[0030] Figure 3 A schematic diagram of the structure of a box assembly provided in an embodiment;

[0031] Figure 4 A schematic diagram of the locations of the BMS and BDU provided in the embodiment;

[0032] Figure 5 A schematic diagram of the structure of the front end lifting lug provided;

[0033] Figure 6 A schematic diagram of the structure of the side front lifting lug provided;

[0034] Figure 7 A schematic diagram of the structure of the side rear lifting ear is provided.

[0035] In the figure:

[0036] 1. Box cover assembly; 101. Box cover body; 1011. Blue edge structure; 1012. Top corner recess; 1013. Peripheral reinforcement; 1014. Center reinforcement; 1015. Reinforced boss; 1016. Water guide groove; 102. Protective pressure strip;

[0037] 2. Battery module;

[0038] 3. Heating component;

[0039] 4. Anti-clotting;

[0040] 5. Box assembly;

[0041] 501, box body; 5011, battery compartment;

[0042] 502, strengthen the frame assembly; 5021, strengthen the frame; 5022, cross beam; 5023, longitudinal beam; 5024, weight reduction hole;

[0043] 503a, front end lifting ear; 503b, side front lifting ear; 503c, side rear lifting ear; 5031, lifting ear body; 5032, lifting ear reinforcement part; 5033, first extension part; 5034, second extension part; 5035, third extension part; 5036, reinforcement groove; 5037, drainage hole;

[0044] 6. Support foam. DETAILED DESCRIPTION

[0045] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it is to be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally disposed component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally disposed component.

[0047] In addition, terms such as "long", "short", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific direction or operate with a specific direction structure, and should not be understood as a limitation of the present invention.

[0048] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0049] The present invention provides a battery pack suitable for application scenarios of storing electric energy, which can effectively solve the problem that the existing battery pack is prone to circuit failure due to dripping of condensed water.

[0050] See also Figure 1 The battery pack provided in this embodiment includes a box assembly 5 having a battery compartment 5011, a battery module 2 located in the battery compartment 5011, a heating assembly 3 located in the battery compartment 5011 and arranged in close contact with the battery module 2, a circuit device located in the battery compartment 5011, and a box cover assembly 1 covering the battery compartment 5011; wherein, see Figure 2 The bottom surface of the box cover assembly 1 is located directly above the circuit device and is provided with an anti-condensation block 4 for inhibiting the condensation of water vapor into condensed water.

[0051] The battery pack provided in this embodiment is provided with an anti-clotting block 4 directly above the circuit device. When the heating component 3 works and causes the temperature in the battery compartment 5011 to rise, water vapor cannot condense into condensed water on the bottom surface of the anti-clotting block 4, thereby effectively preventing the condensed water from falling down to the circuit device and causing the circuit device to short-circuit.

[0052] Therefore, the battery pack provided by the present invention can effectively solve the problem that condensed water easily drips onto circuit components, causing short circuits in the circuit components.

[0053] It should be noted that the battery module 2 generally will not cause circuit failure due to condensed water dripping. In order to reduce the heat dissipation effect on the box cover assembly 1, it is only necessary to set the anti-condensation block 4 at the position corresponding to the circuit device.

[0054] In this embodiment, the circuit device includes a BMS and / or a BDU (full name: Battery energy Distribution Unit, which refers to the battery energy distribution unit, an important component in the high-voltage circuit of an electric vehicle). Furthermore, the point where circuit failure is most likely to occur is the data acquisition line interface of the BMS, so the anti-clotting block 4 can be set above the BMS.

[0055] Optionally, the anti-clotting block 4 is made of non-metallic materials such as waterproof foam, polystyrene foam (EPS), polyvinyl chloride foam (PVC) or polyurethane foam (PU), and the specific heat capacity and thermal conductivity are much lower than those of the box cover body 101 made of steel. This can prevent the anti-clotting block 4 from forming condensed water due to excessive temperature difference between the inside and outside of the box cover body 101, as in the case of the box cover body 101.

[0056] Alternatively, a hydrophobic coating such as an anti-condensation coating may be applied to the block to reduce surface moisture absorption and reduce the formation of condensed water.

[0057] In this embodiment, the anti-clotting block 4 protrudes downward relative to the box cover body 101. If condensed water accumulates on the bottom surface of the box cover body 101, the anti-clotting block 4 can also limit the condensed water to prevent it from flowing along the box cover body 101 to the top of the BMS, thereby preventing the condensed water from dripping onto the collection line interface of the BMS.

[0058] Optionally, the box cover assembly 1 includes a box cover body 101, the edge of the box cover body 101 is a flange edge structure 1011, and a protective strip 102 is provided. Optionally, the protective strip 102 is made of HC340 / 590DP, which has high strength and hardness and is not easy to deform. It can be fixed to the top of the flange edge structure 1011 by gluing so as to fit more closely with the box cover.

[0059] The protective pressure strip 102 is in the shape of a long strip, and the punching position matches the fastening hole on the flange edge structure 1011, which prevents the torque attenuation of the fastener and avoids the disadvantages of the flange edge structure 1011 being deformed and the sealing being not tight due to the excessive torque of the fastener in the box cover assembly. It can increase the installation strength between the box cover assembly and the battery box, and improve the fixing torque of the fastener and prevent the torque attenuation of the fastener.

[0060] In this embodiment, each top corner position of the top surface of the box cover body 101 is provided with a top corner recessed portion 1012 that is recessed downward, and a peripheral reinforcement portion 1013 that is protruding upward is provided between two adjacent top corner recessed portions 1012, and a central reinforcement portion 1014 that is protruding upward is provided at the center position of the top surface of the box cover body 101. Each of the peripheral reinforcement portions 1013 is connected to the central reinforcement portion 1014, and a water guide groove 1016 that is connected to the corresponding top corner recessed portion 1012 is provided between two adjacent peripheral reinforcement portions 1013.

[0061] Since the box cover body 101 is a flat structure as a whole, the torsion resistance of the box cover body 101 is poor, and further, the torsion resistance at the center of the box cover body 101 is the worst. In this embodiment, a downwardly concave top corner recess 1012 and an upwardly protruding peripheral reinforcement 1013 are provided at the box cover body 101, which can effectively improve the torsion resistance of the box cover body 101. Furthermore, an upwardly protruding central reinforcement 1014 is provided at the center of the top surface of the box cover body 101, and each of the peripheral reinforcements 1013 is connected to the central reinforcement 1014, which can greatly improve the torsion resistance at the center of the box cover body 101, so that the structural strength of the entire box cover body 101 is greatly improved.

[0062] Optionally, a plurality of upwardly protruding reinforcing bosses 1015 are further provided at the top corner recess 1012 to further enhance the structural strength of the top corner recess 1012 .

[0063] See also Figure 3 The box assembly 5 includes a box body 501, a reinforcement frame assembly 502, and a lifting ear assembly. The box body 501 is provided with a battery compartment 5011 with an upward opening; the reinforcement frame assembly 502 is installed in the battery compartment 5011; and the lifting ear assembly is fixedly arranged on the outside of the box body 501.

[0064] Optionally, the side of the box body 501 is a stamping structure. The stamping structure of the side of the box body 501 has two advantages: 1) the strength of the side of the box body 501 can be enhanced; 2) because the side of the box body 501 is long, it is difficult to form the sheet metal process, which may cause pits and unsatisfactory flatness. The stamping structure can avoid this drawback.

[0065] The box body 501 with a stamped structure alone cannot meet the overall strength requirements, so the reinforcing frame assembly 502 is added to improve the overall strength and modality of the battery pack. The battery module 2 is fixed on the reinforcing frame assembly 502 as a whole. Because the strength of the reinforcing frame assembly 502 is greater than the strength of the box body 501, most of the weight of the battery module 2 is borne by the reinforcing frame assembly 502, which greatly improves the overall strength of the battery pack.

[0066] See also Figure 1 and Figure 4 The reinforced frame assembly 502 includes a reinforced frame 5021 that is in contact with the four side walls of the battery compartment 5011, a plurality of cross beams 5022 connected to the reinforced frame 5021, and a longitudinal beam 5023 that is connected to the reinforced frame 5021 and is vertically arranged with each of the cross beams 5022; wherein the battery module 2 is placed on each of the cross beams 5022.

[0067] Optionally, the reinforced frames 5021 on all sides are connected to the box body 501 by spot welding, and the reinforced frames 5021, the beams 5022, and the beams 5022 are connected in pairs by spot welding and / or rivet nuts.

[0068] Generally, the middle area of ​​the box body 501 is subjected to the greatest stress. Therefore, two cross beams 5022 and one longitudinal beam 5023 are added to the weakest area to increase the structural strength of the weakest area. The optimal position is obtained through continuous simulation. The frame assembly 502 is strengthened to perfectly match the stamping structure of the box body 501, thereby saving space and making space utilization more reasonable.

[0069] Optionally, the longitudinal beam 5023 and / or the transverse beam 5022 are provided with weight-reducing holes 5024, which not only meets the overall structural strength requirements, but also reduces the weight of the entire pack and improves the energy density of the battery pack.

[0070] In this embodiment, the box body 501 includes two oppositely arranged side surfaces, one end of the two side surfaces are connected by a front end surface, and the other end of the two side surfaces are connected by a rear end surface, wherein the battery module 2 is located in the battery compartment 5011 close to the rear end surface, and the circuit device is located in the battery compartment 5011 close to the front end surface.

[0071] The ear assembly includes a plurality of front end ears 503a fixed on the front end surface, a side front ear 503b fixed on the side surface close to the front end surface, and a side rear ear 503c fixed on the side surface close to the rear end surface; wherein the side front ear 503b and the side rear ear 503c are both arranged corresponding to the top angle position of the battery module 2.

[0072] It should be noted that the battery module 2 is heavier than the BMS and BDU, and the side front lug 503b and the side rear lug 503c are both set corresponding to the top angle position of the battery module 2. The selection of the lug position is very reasonable, so that the stress between the box body 501 and the lug is minimized, thereby improving the strength of the box assembly 5.

[0073] In this embodiment, the front end ear 503a mainly bears the weight of the BMS and BDU, and has a relatively small workload; the side front ear 503b and the side rear ear 503c mainly bear the weight of the battery module 2, and have a relatively large workload. Therefore, the dimensions (including height and / or width) of the side front ear 503b and the side rear ear 503c are larger than those of the front end ear 503a, so as to increase the weldable area between the side front ear 503b and the side rear ear 503c and the box body 501, thereby improving the connection strength between the side front ear 503b and the side rear ear 503c and the box body 501.

[0074] In this embodiment, see Figure 5-Figure 7 Each lifting lug is also designed by stamping and bending. Specifically, each lifting lug includes a lifting lug body 5031 and a lifting lug reinforcement part 5032. The lifting lug body 5031 and the lifting lug reinforcement part 5032 are fixedly connected by resistance spot welding and then spot welded to the box body 501. The lifting lug reinforcement part 5032 can provide a larger spot welding area, thereby improving the connection reliability between the lifting lug and the box body 501.

[0075] Optional, see Figure 6 The ear reinforcement portion 5032 of the side front ear 503b may include a first extension portion 5033 extending to the bottom surface of the box body 501 to increase the weldable area between the side front ear 503b and the box body 501; see Figure 7The ear reinforcement portion 5032 of the side rear ear 503c may include a second extension portion 5034 extending to the bottom surface of the box body 501 and a third extension portion 5035 extending to the rear end surface of the box body 501 to increase the weldable area between the side front ear 503b and the box body 501.

[0076] See also Figure 5-Figure 7 The upper surfaces of the front end lifting ear 503a, the side front lifting ear 503b and the side rear lifting ear 503c are all provided with a downwardly concave reinforcement groove 5036. Furthermore, the reinforcement grooves 5036 of the front end lifting ear 503a and the side front lifting ear 503b extend from top to bottom, and the bottoms of the reinforcement grooves 5036 of the front end lifting ear 503a and the side front lifting ear 503b are provided with drainage holes 5037. The reinforcement grooves 5036 can not only strengthen the structural strength of the lifting ear, but also drain the accumulated water to prevent the lifting ear from being corroded and damaged by the accumulated water.

[0077] In this embodiment, the heating component 3 includes a thermally conductive adhesive layer and an electric heating wire built into the thermally conductive adhesive layer. Optionally, the thermally conductive adhesive layer is made of silicone. The silicone performs heat conduction and insulation protection, and the resistance wire is heated. Compared with traditional liquid heat and direct heat, the silicone heating film has a higher temperature rise rate and heats faster, which can make the battery module 2 heat up in a short time, thereby releasing more energy. Secondly, the silicone heating film has a lower cost and is easier to install, which can greatly save costs and improve production efficiency. Furthermore, the heating component 3 is fixed to the bottom of the battery module 2 by double-sided tape.

[0078] In this embodiment, a support foam 6 is provided at the bottom of the heating component 3. The support foam 6 has excellent compression deformation resistance and IP67 waterproof performance, which can meet the needs of many buffering applications. The support foam 6 is located between the heating component 3 and the bottom of the battery compartment 5011. The support foam 6 has double-sided adhesive backing, and is fixed to the box body 501 and the heating component 3 mainly by pre-fixing with double-sided adhesive. After that, the battery module 2 will give the support foam 6 a downward extrusion force, which can provide support and buffering for the battery module 2, reducing the risk of the battery module 2 being subjected to excessive force during vibration, resulting in the shell rupture and failure.

[0079] Optionally, the box body 501 is recessed downward to form a storage groove for storing the supporting foam 6. The storage groove can also increase the structural strength of the box body 501, and can maximize the overall strength of the box body 501. Furthermore, the positions of the BMS and BDU are both recessed downward to form a storage groove, which can facilitate the positioning of the supporting foam 6, BMS and BDU, and can make full use of the height space to improve the structural compactness of the battery pack.

[0080] The size selection of the supporting foam 6 requires rigorous verification. In order to keep the bottom surface of the battery module 2 level after the battery module 2 is placed, it is concluded after a large number of experiments that the stress of the supporting foam 6 is best maintained when it is compressed by about 20%. Therefore, in this embodiment, the thickness of the supporting foam 6 after being placed in the battery module 2 is about 80% of the thickness before being placed in the battery module 2 (for example, 75%-85%), so as to obtain the best supporting effect.

[0081] In this embodiment, the supporting foam 6 has a low thermal conductivity, which can reduce the heat transfer between the heating component 3 and the box body 501 and avoid heat dissipation.

[0082] In summary, the battery pack provided in this embodiment has the following beneficial effects:

[0083] ① An anti-coagulation block 4 is arranged directly above the circuit device, so that water vapor cannot condense into condensed water on the bottom surface of the anti-coagulation block 4, thereby effectively preventing the condensed water from falling down to the circuit device and causing the circuit device to short-circuit;

[0084] ② The box cover body 101 is designed with multiple concave and convex alternating positions, which improves the torsion resistance of the box cover body 101 and the drainage performance of the box cover body 101, thereby preventing the box cover body 101 from being corroded and damaged by water accumulation;

[0085] ③ A reinforcing frame assembly 502 is provided inside the box body 501 to improve the overall structural strength of the battery pack;

[0086] ④ Arrange the various lifting ears reasonably according to the position of the battery module 2, so that the stress between the box body 501 and the lifting ears is minimized, thereby improving the strength of the box assembly 5;

[0087] ⑤ Each lifting lug is provided with a reinforcing groove 5036, which can not only strengthen the structural strength of the lifting lug, but also drain the accumulated water to prevent the lifting lug from being corroded and damaged due to the accumulated water;

[0088] ⑥ Optimize the compression ratio of the thickness of the supporting foam 6 to obtain the best supporting effect.

[0089] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0090] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: It comprises a box assembly (5) provided with a battery compartment (5011), a battery module (2) located in the battery compartment (5011), a heating assembly (3) located in the battery compartment (5011) and arranged in close contact with the battery module (2), a circuit device located in the battery compartment (5011), and a box cover assembly (1) covering the battery compartment (5011); Wherein, an anti-condensation block (4) for inhibiting condensation of water vapor into condensed water is provided on the bottom surface of the box cover assembly (1) located directly above the circuit device.

2. The battery pack according to claim 1, characterized in that: The box cover assembly (1) comprises a box cover body (101) and a protective pressure strip (102) arranged at an edge of the box cover body (101).

3. The battery pack according to claim 2, characterized in that: Each top corner position of the top surface of the box cover body (101) is provided with a top corner recessed portion (1012) recessed downwards, a peripheral reinforcement portion (1013) protruding upwards is provided between two adjacent top corner recessed portions (1012), and a central reinforcement portion (1014) protruding upwards is provided at the center position of the top surface of the box cover body (101); Each of the peripheral reinforcement portions (1013) is connected to the central reinforcement portion (1014), and a water guide groove (1016) connected to the corresponding top corner recessed portion (1012) is provided between two adjacent peripheral reinforcement portions (1013).

4. The battery pack according to claim 1, characterized in that: The box assembly (5) comprises: A box body (501), wherein the box body (501) is provided with a battery compartment (5011) with an opening facing upwards; A reinforcement frame assembly (502), wherein the reinforcement frame assembly (502) is installed in the battery compartment (5011); A lifting ear component, wherein the lifting ear component is fixedly arranged on the outside of the box body (501).

5. The battery pack according to claim 4, characterized in that: The reinforced frame assembly (502) comprises a reinforced frame (5021) fitted with the four side walls of the battery compartment (5011), a plurality of crossbeams (5022) connected to the reinforced frame (5021), and a longitudinal beam (5023) connected to the reinforced frame (5021) and arranged perpendicularly to each of the crossbeams (5022); Wherein, the battery module (2) is placed on each of the crossbeams (5022).

6. The battery pack according to claim 4, characterized in that: The box body (501) comprises two side surfaces arranged opposite to each other, one end of the two side surfaces being connected via a front end surface, and the other end of the two side surfaces being connected via a rear end surface, wherein the battery module (2) is located in the battery compartment (5011) near the rear end surface, and the circuit device is located in the battery compartment (5011) near the front end surface; The lifting ear assembly comprises a plurality of front lifting ears (503a) fixedly arranged on the front end surface, a side front lifting ear (503b) fixedly arranged on the side surface close to the front end surface, and a side rear lifting ear (503c) fixedly arranged on the side surface close to the rear end surface; Wherein, the side front lifting ear (503b) and the side rear lifting ear (503c) are both arranged corresponding to the top angle positions of the battery module (2).

7. The battery pack according to claim 6, characterized in that: The upper surfaces of the front end lifting ear (503a), the side front lifting ear (503b) and the side rear lifting ear (503c) are all provided with a downwardly recessed reinforcement groove (5036).

8. The battery pack according to claim 7, characterized in that: The reinforcement grooves (5036) of the front end lifting ear (503a) and the side front lifting ear (503b) extend from top to bottom, and drainage holes (5037) are provided at the bottoms of the reinforcement grooves (5036) of the front end lifting ear (503a) and the side front lifting ear (503b).

9. The battery pack according to claim 1, characterized in that: The heating component (3) comprises a heat-conducting adhesive layer and a heating wire built into the heat-conducting adhesive layer.

10. The battery pack according to claim 8, characterized in that: A supporting foam (6) is provided below the heating component (3), and the thickness of the supporting foam (6) after being placed in the battery module (2) is 75%-85% of the thickness before being placed in the battery module (2).

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