Battery pack and electric equipment

Abstract

The utility model relates to the technical field of new energy batteries, and discloses a battery pack and electric equipment, and the battery pack comprises a battery cell which is provided with a first wall surface; the anti-explosion valve is assembled on the first wall surface; the heat management accessory is provided with an avoiding hole; the insulating plate is arranged on the side, close to the first wall face, of the heat management accessory, the insulating plate comprises an assembling part and a protection part, at least part of the protection part is embedded in the receding hole, and a gap is formed between the part, embedded in the receding hole, of the protection part and the receding hole. When entering the avoiding hole, a high-temperature conductive substance discharged by the explosion-proof valve is not in direct contact with the avoiding hole, and the insulating plate plays a role in insulating and isolating the conductive substance from the avoiding hole; meanwhile, the interval is convenient for the protection part to enter the avoiding hole during assembly, the interval also forms an air interlayer, and the air interlayer has a heat insulation effect when the battery is in thermal runaway, so that the damage of high temperature to the thermal management accessory is reduced, and the safety of the battery pack is improved.

Description

Technical Field

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

[0002] Currently, power batteries are increasingly being used in a wide range of applications. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of power batteries continue to expand, market demand is also growing.

[0003] Power batteries are assembled in battery packs, which consist of battery cells and a liquid cooling plate. The cells are mounted on the liquid cooling plate, which regulates the cell temperature to prevent thermal runaway. An explosion-proof valve is located at the bottom of the cell to quickly vent internal gas in the event of runaway. A gas escape channel is located on the liquid cooling plate, corresponding to the explosion-proof valve, to allow high-temperature gas to escape.

[0004] However, the high-temperature gas discharged when the battery cell loses control will carry electrolyte. When the electrolyte comes into contact with the inner wall of the channel of the liquid cooling plate, there will be a risk of conductivity, making the battery pack unable to meet the insulation requirements after thermal runaway, posing a safety hazard. Utility Model Content

[0005] The purpose of the utility model is to provide a battery pack to solve the problem in the prior art of risk of thermal runaway of battery cells and liquid cooling plates; the utility model also provides an electrical device using the battery pack.

[0006] In order to achieve the above objectives, the present invention provides a battery pack, comprising:

[0007] A battery cell having a first wall surface;

[0008] an explosion-proof valve, the explosion-proof valve being mounted on the first wall surface;

[0009] A thermal management accessory, wherein the thermal management accessory has an avoidance hole, and the avoidance hole corresponds to the position of the explosion-proof valve;

[0010] An insulating plate, wherein the insulating plate is fixed to a side of the thermal management accessory close to the first wall surface, the insulating plate includes an assembly portion and a protective portion connected to the assembly portion, the assembly portion is fixedly connected to the thermal management accessory, the protective portion is at least partially embedded in the avoidance hole, and there is a gap between the portion of the protective portion embedded in the avoidance hole and the hole wall of the avoidance hole.

[0011] Preferably, the avoidance hole passes through the thermal management accessory, the protective portion includes a side plate, and the interval is provided between the hole wall and the side plate.

[0012] Preferably, the distance between one end of the side plate away from the first wall and the first wall is H1, the distance between one end of the hole wall away from the first wall and the first wall is H2, and H1>H2.

[0013] Preferably, the side plate includes a main section and a chamfered section, the main section is arranged parallel to the hole wall and spaced apart, the chamfered section is arranged at one end of the main section away from the explosion-proof valve, and the chamfered section is bent relative to the main section toward the side away from the hole wall.

[0014] Preferably, the protective portion further comprises a bottom plate, the bottom plate is connected to the chamfered section, and a weak portion is provided at the connection between the bottom plate and the chamfered section.

[0015] Preferably, a groove is provided at the connection between the bottom plate and the chamfered section, and the groove forms the weak portion.

[0016] Preferably, a flame retardant plate is further included, and the flame retardant plate is arranged on a side of the bottom plate close to the first wall surface, and the flame retardant plate covers the weak portion.

[0017] Preferably, the assembly portion comprises a base segment and an overlapping segment, the overlapping segment is overlapped with the thermal management accessory, and the protective portion is arranged on the base segment.

[0018] The utility model also provides a battery pack, comprising:

[0019] A battery cell having a first wall surface;

[0020] an explosion-proof valve, the explosion-proof valve being mounted on the first wall surface;

[0021] A thermal management accessory, the thermal management accessory having an avoidance groove, the avoidance groove corresponding to the position of the explosion-proof valve, the avoidance groove having a side wall and a bottom wall;

[0022] An insulating plate, wherein the insulating plate is fixed to a side of the thermal management accessory close to the first wall surface, the insulating plate includes an assembly portion and a protective portion connected to the assembly portion, the assembly portion is fixedly connected to the thermal management accessory, the protective portion is at least partially embedded in the avoidance groove, the protective portion includes a side plate and a bottom plate, and there are gaps between the side walls and the side plates, and between the bottom wall and the bottom plate.

[0023] The utility model also provides an electrical device, comprising the battery pack described in any of the above technical solutions.

[0024] Compared with the prior art, the battery pack and electrical equipment of the embodiment of the present invention have the following beneficial effects: an insulating plate is arranged between the thermal management accessory and the first wall surface of the battery cell, and the protective part of the insulating plate extends into the avoidance hole or avoidance groove of the thermal management accessory. When the battery cell thermally runs away, the high-temperature conductive material discharged through the explosion-proof valve contacts the protective part of the insulating plate when entering the avoidance hole or avoidance groove, and does not directly contact the avoidance hole or avoidance groove. The insulating plate plays the role of insulating and isolating the conductive material from the avoidance hole or avoidance groove, and the battery pack meets the insulation requirements after thermal runaway; at the same time, there is a gap between at least part of the protective part and the avoidance hole or avoidance groove, which facilitates the protective part of the insulating plate to enter the avoidance hole or avoidance groove during assembly, and the gap also forms an air interlayer. When the battery thermally runs away, the air interlayer has the effect of heat insulation and heat preservation, reduces the damage to the thermal management accessory caused by high temperature, and improves the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the battery pack of the present utility model;

[0026] Figure 2 yes Figure 1 A top view of the battery pack;

[0027] Figure 3 yes Figure 1 A schematic structural diagram of an insulating plate of a battery pack;

[0028] Figure 4 is a half-sectional view of the insulating plate in the first embodiment of the battery pack of the present invention;

[0029] Figure 5 yes Figure 4 A partial enlarged schematic diagram of position C of the insulating plate;

[0030] Figure 6 yes Figure 5 A cross-sectional view of the insulation board, thermal management accessories, and battery cell after assembly;

[0031] Figure 7 yes Figure 6 A local enlarged schematic diagram of point F;

[0032] Figure 8 This is a half-sectional view of the insulating plate in the second embodiment of the battery pack of the present utility model;

[0033] Figure 9 yes Figure 8 A partial enlarged schematic diagram of position B of the insulating plate;

[0034] Figure 10 yes Figure 9 A cross-sectional view of the insulation board, thermal management accessories, and battery cell after assembly;

[0035] Figure 11 yes Figure 10 A local enlarged schematic diagram of point E;

[0036] Figure 12 This is a half-sectional view of the insulating plate in the third embodiment of the battery pack of the present utility model;

[0037] Figure 13 yes Figure 12 A partial enlarged schematic diagram of the insulating plate at A;

[0038] Figure 14 yes Figure 13 A cross-sectional view of the insulation board, thermal management accessories, and battery cell after assembly;

[0039] Figure 15 yes Figure 14 A local enlarged schematic diagram of point D;

[0040] Figure 16 This is a cross-sectional view of the structure of the fourth embodiment of the battery pack of the present invention after the insulation plate, thermal management accessories, and battery cells are assembled;

[0041] Figure 17 yes Figure 16 A local enlarged schematic diagram of point G.

[0042] In the figure, 1. battery cell, 11. first wall, 2. explosion-proof valve, 3. thermal management accessory, 31. avoidance hole, 311. hole wall, 32. avoidance groove, 321. side wall, 322. bottom wall, 4. insulating plate, 41. assembly part, 411. base section, 412. overlapping section, 42. protective part, 421. side plate, 4211. main body section, 4212, chamfered section, 422, bottom plate, 43. weak part, 431. groove, 5. interval, 6. flame retardant plate, 7. box body. DETAILED DESCRIPTION

[0043] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0044] A preferred embodiment of a battery pack of the present utility model is as follows: Figures 1 to 15 As shown, the battery pack includes a box body 7, a battery cell 1, an explosion-proof valve 2, a thermal management accessory 3 and an insulating plate 4. The box body 7 is the outermost protective structure of the battery pack, and the battery cell 1, the explosion-proof valve 2, the thermal management accessory 3 and the insulating plate 4 are all assembled in the box body 7.

[0045] The battery cell 1 has a first wall 11, and the explosion-proof valve 2 is mounted on the first wall 11. In this embodiment, the first wall 11 is the bottom surface of the battery cell 1. The explosion-proof valve 2 is mounted on the first wall 11. When the battery cell 1 experiences thermal runaway, the high-pressure and high-temperature substances inside the battery cell 1 are discharged through the explosion-proof valve 2.

[0046] The thermal management accessory 3 is mounted at the bottom of the battery pack, and the battery cell 1 is mounted on the thermal management accessory 3. The thermal management accessory 3 regulates the temperature of the battery cell 1. In this embodiment, the thermal management accessory 3 is a liquid cooling plate with internal flow channels. The thermal management accessory 3 has a relief hole 31, which corresponds to the position of the explosion-proof valve 2. If the thermal management of the battery cell 1 fails, the high-temperature, high-pressure gas in the battery cell 1 will be released through the explosion-proof valve 2, enter the relief hole 31 of the thermal management accessory 3, and then be discharged from the battery pack through the relief hole 31.

[0047] The insulating plate 4 is fixed to one side of the first wall 11 of the thermal management accessory 3 close to the battery cell 1. The insulating plate 4 is used to insulate and isolate the avoidance hole 31 of the thermal management accessory 3 from the high-temperature conductive material discharged through the explosion-proof valve 2, avoiding the risk of conductivity in the avoidance hole 31 of the thermal management accessory 3 and improving the safety of the battery pack.

[0048] The insulating plate 4 includes a mounting portion 41 and a protective portion 42 connected to the mounting portion 41. The mounting portion 41 is fixedly connected to the thermal management accessory 3, thereby securing the connection between the insulating plate 4 and the thermal management accessory 3. The protective portion 42 partially extends into the avoidance hole 31, covering the avoidance hole 31 and providing overall insulation protection for the avoidance hole 31, thereby improving the insulation at the avoidance hole 31. In this embodiment, the insulating plate 4 is made of PPS (polyphenylene sulfide), a new high-performance thermoplastic resin with advantages such as high mechanical strength, high temperature resistance, chemical resistance, flame retardancy, good thermal stability, and excellent electrical properties.

[0049] A gap 5 is formed between the portion of the protective portion 42 embedded in the avoidance hole 31 and the hole wall 31 of the avoidance hole 31. After the insulating plate 4 and the thermal management accessory 3 are assembled, the gap 5 between the protective portion 42 and the avoidance hole 31 forms an air layer. This air layer provides thermal insulation and protects the thermal management accessory 3 in the event of thermal runaway of the battery cell 1.

[0050] The battery pack is provided with an insulating plate 4 between the thermal management accessory 3 and the first wall surface 11 of the battery cell 1, and the protective portion 42 of the insulating plate 4 extends into the avoidance hole 31 of the thermal management accessory 3. When the battery cell 1 thermally runs away, the high-temperature conductive material discharged through the explosion-proof valve 2 contacts the protective portion 42 of the insulating plate 4 when entering the avoidance hole 31, and does not directly contact the avoidance hole 31. The insulating plate 4 plays the role of insulating and isolating the conductive material from the avoidance hole 31, and the battery pack meets the insulation requirements after thermal runaway; at the same time, there is a gap 5 between at least part of the protective portion 42 and the avoidance hole 31, and the gap 5 facilitates the entry of the protective portion 42 of the insulating plate 4 into the avoidance hole 31 during assembly, and the gap 5 also forms an air interlayer. When the battery thermally runs away, the air interlayer has the effect of heat insulation and heat preservation, reduces the damage to the thermal management accessory 3 caused by high temperature, and improves the safety of the battery pack.

[0051] Preferably, the avoidance hole 31 passes through the thermal management accessory 3 , the protection portion 42 includes a side plate 421 , and the spacer 5 is provided between the hole wall 311 and the side plate 421 .

[0052] like Figures 4 to 7 As shown, in the first embodiment of the battery pack, the protective portion 42 protects the hole wall 311 of the avoidance hole 31. The spacer 5 only needs to be provided between the hole wall 311 and the side plate 421. Therefore, the protective portion 42 only needs to include the side plate 421, simplifying the structure of the protective portion 42. In this embodiment, a smooth transition is formed between the side plate 421 and the assembly portion 41. The end of the side plate 421 away from the first wall 11 is a plane parallel to the hole wall 311 of the avoidance hole 31.

[0053] Preferably, the distance between the end of the side plate 421 away from the first wall surface 11 and the first wall surface 11 is greater than the distance between the end of the hole wall 311 away from the first wall surface 11 and the first wall surface 11 .

[0054] like Figure 7 and Figure 11As shown in the figure, the distance between the end of the side plate 421 away from the first wall 11 and the first wall 11 is H1, and the distance between the end of the hole wall 311 away from the first wall 11 and the first wall 11 is H2. As can be seen from the figure, H1>H2, that is, the end face of the side plate 421 is lower than the hole edge of the avoidance hole 31. The side plate 421 can fully cover the hole wall 311 of the avoidance hole 31. When the battery cell 1 experiences thermal runaway, the high-temperature conductive material enters the avoidance hole 31 through the protective portion 42. Because the end face of the side plate 421 is lower than the hole edge of the avoidance hole 31, the high-temperature conductive material is discharged through the side plate 421 and is lower than the avoidance hole 31. This prevents the high-temperature conductive medium from returning to the avoidance hole 31, and the protective effect is better. In other embodiments, the distance H1 between the end of the side panel 421 away from the first wall 11 and the first wall 11 is equal to the distance H2 between the end of the hole wall 311 away from the first wall 11 and the first wall 11, so that the side panel 421 can fully cover the hole wall 311 of the avoidance hole 31 and provide insulation protection for the avoidance hole 31.

[0055] Preferably, the side plate 421 includes a main body section 4211 and a chamfered section 4212. The main body section 4211 is arranged parallel to the hole wall 311 with an interval of 5. The chamfered section 4212 is arranged at the end of the main body section 4211 away from the explosion-proof valve 2. The chamfered section 4212 is bent relative to the main body section 4211 toward the side away from the hole wall 311.

[0056] like Figures 8 to 11 As shown, in the second embodiment of the battery pack, a chamfered section 4212 is formed at the bottom end of the main section 4211 of the side panel 421. Since the chamfered section 4212 is bent relative to the main section 4211 toward the side away from the hole wall 311, after the high-temperature conductive material leaks out through the explosion-proof valve 2 and enters the protective portion 42 of the insulating plate 4, the chamfered section 4212 has a gathering and guiding effect on the high-temperature conductive material at the edge, so that the released high-temperature conductive material is away from the avoidance hole 31, thereby preventing the high-temperature conductive medium from returning to the avoidance hole 31.

[0057] Preferably, the protective portion 42 further includes a bottom plate 422 , the bottom plate 422 is connected to the chamfered section 4212 , and a weak portion 43 is provided at the connection between the bottom plate 422 and the chamfered section 4212 .

[0058] like Figures 12 to 15As shown, in the third embodiment of the battery pack, the protective portion 42 further includes a bottom plate 422. After the bottom plate 422 is connected to the chamfered section 4212, the entire protective portion 42 forms a closed structure, sealing the avoidance hole 31. The discharge channels of the same battery module in the battery pack are interconnected. When adjacent battery cells 1 experience thermal runaway, the high-temperature conductive material discharged through the explosion-proof valve 2 will affect the safety of the adjacent battery cells 1 when it is discharged outward. The closed structure of the protective portion 42 prevents the high-temperature conductive material discharged from other battery cells 1 from backflowing into the protective portion 42 and affecting the adjacent battery cells 1, thereby improving the safety of the battery pack.

[0059] A weak portion 43 is provided at the connection between the bottom plate 422 and the chamfered section 4212. The weak portion 43 reduces the strength of the connection between the bottom plate 422 and the chamfered section 4212. When the battery cell 1 is in thermal runaway, the discharge of high-temperature conductive material under high pressure can break through the weak portion 43, thereby achieving the discharge of the high-temperature conductive material. At the same time, the high-temperature conductive material discharged by the battery cell 1 will not reversely break through the weak portion 43 at the bottom of the adjacent battery cell 1 after the pressure is reduced during the discharge process, thereby avoiding affecting the adjacent battery cell 1.

[0060] Preferably, a groove 431 is provided at the connection between the bottom plate 422 and the chamfered section 4212 , and the groove 431 forms a weak portion 43 .

[0061] like Figure 15 As shown, groove 431 forms a weak portion 43. Groove 431 can be formed through simple machining, simplifying the structure of weak portion 43. In this embodiment, groove 431 forms a closed loop structure around the circumference of avoidance hole 31. The shape of groove 431 ensures that the connection between the bottom end of bottom plate 422 and chamfered section 4212 forms a closed structure around the entire circumference of avoidance hole 31, preventing substances released from other battery cells 1 from entering adjacent battery cells 1. In other embodiments, multiple grooves 431 can be arranged around the circumference of avoidance hole 31, with each groove 431 being discontinuous, so that the multiple grooves 431 form a weak portion.

[0062] In other embodiments, multiple through holes may be opened at intervals of 5 at the connection between the bottom plate 422 and the chamfered section 4212 to form a weak portion 43 ; or the bottom plate 422 and the chamfered section 4212 may be connected in a point-disconnected manner to form a weak portion 43 .

[0063] Preferably, a flame retardant plate 6 is further included. The flame retardant plate 6 is arranged on a side of the bottom plate 422 close to the first wall 11 , and the flame retardant plate 6 covers the weak portion 43 .

[0064] A flame retardant plate 6 is arranged on the bottom plate 422 to cover the weak part 43. When the bottom plate 422 is reversely broken by the high-temperature conductive material discharged from other battery cells 1, the flame retardant plate 6 can further isolate the high temperature of the discharged material, prevent the adjacent battery cells 1 from thermal runaway, and improve the safety of the battery pack.

[0065] Preferably, the assembly portion 41 includes a base segment 411 and an overlapping segment 412 , the overlapping segment 412 overlaps and cooperates with the thermal management accessory 3 , and the protective portion 42 is arranged on the base segment 411 .

[0066] like Figures 1 to 3 As shown, the assembly portion 41 is overlapped with the thermal management accessory 3 via the overlap section 412, simplifying the assembly between the assembly portion 41 and the thermal management accessory 3. In this embodiment, the overlap section 412 is provided with adhesive, so that the overlap section 412 and the management accessory are bonded and fixed.

[0067] The present utility model also provides a fourth embodiment of a battery pack, such as Figure 16 and Figure 17 As shown, this battery pack differs from the first embodiment in that the thermal management attachment 3 has an escape groove 32 with side walls 321 and a bottom wall 322. The protective portion 42 includes side panels 421 and a bottom panel 422. Spacers 5 are provided between the side walls 321 and the bottom wall 322. The protective portion 42 is formed by the side panels 421 and the bottom panel 422. The side panels 421 and the bottom panel 422 respectively protect the side walls 321 and the bottom wall 322 of the escape groove 32, thereby protecting the entire escape groove 32 and improving the protective effect.

[0068] The present invention also provides a preferred embodiment of an electrical device, including a battery pack. The specific structure of the battery pack is the same as the specific structure of the battery pack described in any of the above embodiments, and will not be repeated here.

[0069] In summary, the embodiments of the present invention provide a battery pack and an electrical device, which has an insulating plate arranged between the thermal management accessory and the first wall of the battery cell, and the protective portion of the insulating plate extends into the avoidance hole or avoidance groove of the thermal management accessory. When the battery cell thermally runs away, the high-temperature conductive material discharged through the explosion-proof valve contacts the protective portion of the insulating plate when entering the avoidance hole or avoidance groove, and does not directly contact the avoidance hole or avoidance groove. The insulating plate plays the role of insulating and isolating the conductive material from the avoidance hole or avoidance groove, and the battery pack meets the insulation requirements after thermal runaway; at the same time, there is a gap between at least part of the protective portion and the avoidance hole or avoidance groove, which facilitates the protective portion of the insulating plate to enter the avoidance hole or avoidance groove during assembly, and the gap also forms an air interlayer. When the battery thermally runs away, the air interlayer has the effect of heat insulation and heat preservation, reduces the damage to the thermal management accessory caused by high temperature, and improves the safety of the battery pack.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: include: A battery cell having a first wall surface; an explosion-proof valve, the explosion-proof valve being mounted on the first wall surface; A thermal management accessory, wherein the thermal management accessory has an avoidance hole, and the avoidance hole corresponds to the position of the explosion-proof valve; An insulating plate, wherein the insulating plate is fixed to a side of the thermal management accessory close to the first wall surface, the insulating plate includes an assembly portion and a protective portion connected to the assembly portion, the assembly portion is fixedly connected to the thermal management accessory, the protective portion is at least partially embedded in the avoidance hole, and there is a gap between the portion of the protective portion embedded in the avoidance hole and the hole wall of the avoidance hole.

2. The battery pack according to claim 1, wherein: The avoidance hole passes through the thermal management attachment, the protection portion includes a side plate, and the interval is arranged between the hole wall and the side plate.

3. The battery pack according to claim 2, wherein: A distance between one end of the side plate away from the first wall and the first wall is H1, and a distance between one end of the hole wall away from the first wall and the first wall is H2, where H1>H2.

4. The battery pack according to claim 3, wherein: The side plate includes a main body section and a chamfered section. The main body section is arranged parallel to the hole wall and spaced apart. The chamfered section is provided at one end of the main body section away from the explosion-proof valve. The chamfered section is bent relative to the main body section toward a side away from the hole wall.

5. The battery pack according to claim 4, characterized in that: The protective portion further includes a bottom plate, which is connected to the chamfered section, and a weak portion is provided at the connection between the bottom plate and the chamfered section.

6. The battery pack according to claim 5, characterized in that: A groove is provided at the connection between the bottom plate and the chamfered section, and the groove forms the weak portion.

7. The battery pack according to claim 5, characterized in that: It also includes a flame retardant plate, which is arranged on a side of the bottom plate close to the first wall surface, and covers the weak portion.

8. The battery pack according to claim 1, wherein: The assembly portion includes a base segment and an overlapping segment, the overlapping segment is overlapped with the thermal management accessory, and the protective portion is arranged on the base segment.

9. A battery pack, characterized in that: include: A battery cell having a first wall surface; an explosion-proof valve, the explosion-proof valve being mounted on the first wall surface; A thermal management accessory, the thermal management accessory having an avoidance groove, the avoidance groove corresponding to the position of the explosion-proof valve, the avoidance groove having a side wall and a bottom wall; An insulating plate, wherein the insulating plate is fixed to a side of the thermal management accessory close to the first wall surface, the insulating plate includes an assembly portion and a protective portion connected to the assembly portion, the assembly portion is fixedly connected to the thermal management accessory, the protective portion is at least partially embedded in the avoidance groove, the protective portion includes a side plate and a bottom plate, and there are gaps between the side walls and the side plates, and between the bottom wall and the bottom plate.

10. An electrical device, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 9.

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