Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment. The battery pack comprises a box body, a battery cell group and a box cover, an accommodating cavity is formed in the box body; the battery cell group is arranged in the accommodating cavity and comprises a plurality of battery cells, and each battery cell is provided with an anti-explosion valve; the box cover covers the box body to cover the containing cavity, at least one overflow groove is formed in the box cover, and the overflow groove can be communicated with the anti-explosion valve. The utility model aims to solve the technical problem that the battery pack is subjected to thermal runaway, and substances such as electrolyte are sprayed out from the explosion-proof valve to cause short circuit of adjacent battery cells or circuits, so that the battery pack is subjected to thermal runaway.

Description

Technical Field

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

[0002] As energy development is transformed from extensive to high-quality development, in order to further solve the problem of energy volatility, it is necessary to integrate technologies such as energy storage into grid optimization, introduce energy storage equipment into base stations, effectively improve battery utilization, reduce power supply costs, and have a certain impact on energy consumption patterns.

[0003] In related technologies, most battery companies use locking screw grouping structures or cell BSB welding processes to first group the cells into modules, and then group the modules into boxes to assemble them into PACKs. There are many steps, and the modules are arranged closely, which easily leads to heat concentration. When thermal runaway occurs in some individual cells inside the PACK, the high-temperature materials ejected from the cells accumulate, causing adjacent cells or lines to short-circuit, triggering a chain reaction in the entire battery pack and causing thermal runaway explosion. Utility Model Content

[0004] The embodiments of the present utility model provide a battery pack and an electrical device, which aim to solve the technical problem that a battery pack may experience thermal runaway, electrolyte and other substances may be ejected from an explosion-proof valve, causing a short circuit in adjacent battery cells or lines, and leading to thermal runaway of the battery pack.

[0005] In a first aspect, an embodiment of the present invention provides a battery pack, comprising:

[0006] A box body, wherein a receiving cavity is formed in the box body;

[0007] A battery cell group is provided in the accommodating cavity and includes a plurality of battery cells, each of which is provided with an explosion-proof valve; and

[0008] A box cover is arranged on the box body to cover the accommodating cavity. At least one overflow groove is formed on the box cover, and the overflow groove can be communicated with the explosion-proof valve.

[0009] In one embodiment, a plurality of communication holes are formed on the bottom of the overflow trough, and the plurality of communication holes are arranged at intervals along the extension direction of the overflow trough, and each of the communication holes corresponds to the explosion-proof valve of each of the battery cells.

[0010] In one embodiment, the overflow trough has a first trough wall and a second trough wall that are oppositely arranged along the extending direction thereof. An outlet is formed on the first trough wall, and the outlet is arranged to pass through the box cover.

[0011] In one embodiment, the thickness of the groove bottom is gradually reduced in the direction from the second groove wall to the first groove wall.

[0012] In one embodiment, an annular boss is provided at one end of each of the communicating holes away from the explosion-proof valve.

[0013] In one embodiment, the box body includes a bottom plate, a first side plate and a first end plate that are separately arranged, the first side plate is connected to one side of the bottom plate, and the first end plate is connected to one end of the bottom plate to squeeze the battery cell group.

[0014] In one embodiment, the first side plate includes a third plate body and a heat conducting plate, the heat conducting plate is arranged on a side of the third plate body close to the battery cell group, and a plurality of heat dissipating fins are provided on a side of the heat conducting plate facing the third plate body, and the plurality of heat dissipating fins are connected to the third plate body.

[0015] In one embodiment, the battery cell group includes a plurality of sub-battery cell groups, the plurality of sub-battery cell groups are arranged in an array, and a heat dissipation plate is provided between two adjacent sub-battery cell groups;

[0016] Wherein, each of the sub-cell groups includes a plurality of the battery cells.

[0017] In one embodiment, each of the heat dissipation plates includes a first plate body, a second plate body and a plurality of partitions, the first plate body and the second plate body are arranged opposite to each other and connected to form a first heat dissipation channel, and the plurality of partitions are connected between the first plate body and the second plate body to divide the first heat dissipation channel into a plurality of sub-heat dissipation channels.

[0018] In one embodiment, a plurality of second heat dissipation holes are formed on the box cover, and the plurality of second heat dissipation holes are staggered with the overflow trough.

[0019] In a second aspect, an embodiment of the present invention provides an electrical device including the above-mentioned battery pack.

[0020] Beneficial effects of the embodiments of the present utility model:

[0021] In the technical solution of the present invention, the overflow tank is used to collect the electrolyte to prevent the electrolyte from splashing onto other battery cells when it is sprayed out, causing damage to other battery cells and exacerbating thermal runaway of the battery pack; specifically, when thermal runaway occurs in the battery pack, the electrolyte in the battery cell is sprayed out from the explosion-proof valve. Since the overflow tank is provided on the box cover, the electrolyte enters the overflow tank after being sprayed out. The overflow tank collects the sprayed electrolyte to avoid the situation where it accumulates in the battery pack and is difficult to discharge, thereby solving the problem in the related art that thermal runaway occurs in local individual battery cells inside the ACK, and the high-temperature materials sprayed from the battery cells accumulate, causing adjacent battery cells or lines to short-circuit, triggering a chain reaction in the entire battery pack and causing thermal runaway explosion; at the same time, the overflow tank is provided on the cover plate, does not occupy additional space, and improves space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a structural diagram of an embodiment of a battery pack provided by the present utility model;

[0024] Figure 2 yes Figure 1 Schematic diagram of the explosion of the battery pack;

[0025] Figure 3 yes Figure 1 Schematic diagram of the battery pack from another perspective (excluding the mica board);

[0026] Figure 4 yes Figure 1 Schematic diagram of the structure of the neutron battery cell group and the heat sink;

[0027] Figure 5 yes Figure 1 Schematic diagram of the structure of the midsole plate and the battery cell group;

[0028] Figure 6 yes Figure 1 A schematic diagram of the structure of the first end plate and the battery cell group;

[0029] Figure 7 yes Figure 1 A schematic diagram of the structure of the first side plate and the battery cell group;

[0030] Figure 8 yes Figure 1 A full cross-sectional diagram of .

[0031] Explanation of Figure Numbers

[0032]

[0033] DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0035] In related technologies, most battery companies use locking screw grouping structures or cell BSB welding processes to first group the cells into modules, and then group the modules into boxes to assemble them into PACKs. There are many steps, and the modules are arranged closely, which easily leads to heat concentration. When thermal runaway occurs in some individual cells inside the PACK, the high-temperature materials ejected from the cells accumulate, causing adjacent cells or lines to short-circuit, triggering a chain reaction in the entire battery pack and causing thermal runaway explosion.

[0036] In view of this, the present invention proposes a battery pack 100. Figures 1 to 8 This is a structural schematic diagram of an embodiment of a battery pack 100 provided by the present invention; the battery pack 100 will be described in detail below in conjunction with the main drawings.

[0037] See also Figure 1 、 Figure 2 and Figure 3 The battery pack 100 includes a box body 4, a battery cell group 10 and a box cover 2. A accommodating cavity is formed in the box body 4; the battery cell group 10 is arranged in the accommodating cavity and includes a plurality of battery cells 11, and each battery cell 11 is provided with an explosion-proof valve 111; the box cover 2 is arranged on the box body 4 to cover the accommodating cavity, and at least one overflow groove 20 is formed on the box cover 2, which can be connected to the explosion-proof valve 111.

[0038] In the technical solution of the present invention, the overflow tank 20 is used to collect the electrolyte to prevent the electrolyte from splashing onto other battery cells 11 when it is sprayed out, causing damage to other battery cells 11 and exacerbating the thermal runaway of the battery pack 100. Specifically, when the battery pack 100 has thermal runaway, the electrolyte in the battery cell 11 is sprayed out from the explosion-proof valve 111. Since the overflow tank 20 is provided on the box cover 2, the electrolyte enters the overflow tank 20 after being sprayed out. The overflow tank 20 collects the sprayed electrolyte to avoid the situation where it accumulates in the battery pack 100 and is difficult to discharge. This solves the problem in the related art that thermal runaway occurs in local individual battery cells 11 inside the ACK, and the high-temperature material sprayed from the battery cell 11 accumulates, causing adjacent battery cells 11 or circuits to short-circuit, causing a chain reaction in the entire battery pack 100, resulting in thermal runaway explosion. At the same time, the overflow tank 20 is provided on the cover plate, does not occupy additional space, and improves space utilization.

[0039] It should be noted that the manner in which the overflow tank 21 is connected to the explosion-proof valve 111 is not limited, and they can be directly connected or indirectly connected.

[0040] For example, in some embodiments, the bottom 21 of the overflow trough 20 is formed with a plurality of communication holes 211. The plurality of communication holes 211 are spaced apart along the extension direction of the overflow trough 20, and each communication hole 211 corresponds to the explosion-proof valve 111 of each battery cell 11. When a problem occurs within the battery pack 100, the electrolyte in the battery cell 11 breaks through the explosion-proof valve 111 and enters the overflow trough 20 through the communication hole 211, thereby preventing the electrolyte from accumulating in the battery pack 100 and being difficult to discharge, thereby improving the safety of the battery pack 100.

[0041] In other embodiments, to further enhance the safety of the battery pack, a one-way valve is provided within the communication hole 211. When the battery pack 100 is operating normally, the one-way valve is closed. However, if a problem occurs within the battery pack 100, the electrolyte within the battery cell 11 ejects, pushing open the one-way valve and flowing into the overflow tank 20. Because the one-way valve is provided within the communication hole, the electrolyte within the overflow tank 20 cannot flow back into the battery cell, thereby further enhancing the safety of the battery pack 100. It should be noted that other structures may also be provided within the communication hole 211, such as a mica plate attached to the communication hole. This is not a limitation in this application and may be selected based on actual circumstances.

[0042] In some embodiments, see Figure 3 and Figure 8To improve the safety of the battery pack 100, an outlet 221 is provided on the cover plate. The electrolyte in the overflow trough 20 can be discharged from the outlet 221, preventing excess electrolyte from flowing back into the battery cells 11 and exacerbating thermal runaway. Specifically, the overflow trough 20 includes a first trough wall 22 and a second trough wall 23 disposed opposite each other along its extension direction. The first trough wall 22 is formed with an outlet 221, which extends through the cover 2. When thermal runaway occurs in the battery pack 100, the electrolyte in the battery cells 11 is ejected from the explosion-proof valve 111, enters the overflow trough 20 through the inlet of the communication hole 211, and then flows out through the outlet 221. This prevents electrolyte from accumulating in the battery pack 100 and making it difficult to discharge, thereby improving the safety of the battery pack 100.

[0043] Further, see 3 and Figure 8 In some embodiments, to facilitate the smooth discharge of electrolyte from the overflow trough 20, the overflow trough 20 is tilted. More specifically, the thickness of the trough bottom 21 gradually decreases as the second trough wall 23 points toward the first trough wall 22. This allows the electrolyte in the overflow trough 20 to flow along the tilted trough bottom 21 and be smoothly discharged from the outlet 221.

[0044] In some embodiments, an annular boss 212 is provided on the end of each communication hole 211 facing away from the explosion-proof valve 111. The function of the annular boss 212 is to raise the height of the opening of the communication hole 211 on the side facing away from the explosion-proof valve 111, thereby preventing the electrolyte sprayed from the previous explosion-proof valve 111 from flowing into the next battery cell 11 through the communication hole 211 and preventing the sprayed electrolyte from flowing back into the housing 4. This provides thermal insulation protection for components such as the collection harness, preventing the collection harness from being corroded by the electrolyte, which could cause a short circuit and lead to loss of control, thereby improving the safety and reliability of the product.

[0045] In some embodiments, see Figure 4 The battery cell group 10 includes multiple sub-battery cell groups 1, each sub-battery cell group 1 includes multiple battery cells 11, and the multiple sub-battery cell groups 1 are arranged in an array, using grid management to group the multiple battery cells 11, and a heat sink 3 is provided between two adjacent sub-battery cell groups 1; more specifically, a heat sink 3 is provided between every two rows of sub-battery cell groups 1, and a heat sink 3 is also provided between every two columns of sub-battery cell groups 1, thereby achieving heat dissipation on multiple surfaces of the battery cells 11, so that the heat generated by the battery cells 11 can be dissipated from multiple directions, quickly conduct the heat, avoid heat concentration, and improve the safety of the battery pack 100.

[0046] Furthermore, each heat sink 3 includes a first plate 31, a second plate 32, and multiple partitions 33. The first plate 31 and the second plate 32 are arranged opposite each other and connected to form a first heat dissipation channel. The multiple partitions 33 are connected between the first plate 31 and the second plate 32 to divide the first heat dissipation channel into multiple sub-heat dissipation channels 34. In this embodiment, the first plate 31 contacts one of the battery cell groups 10, and the second plate 32 contacts the other battery cell group 10. The first and second plates 31, 32 are used to transfer heat from the battery cell groups 10. One function of the multiple partitions 33 is to increase the structural strength of the heat sink 3, and another function is to transfer heat.

[0047] The connection method between the partitions 33 and the first and second plates 31, 32 is not limited. In some embodiments, multiple partitions 33 are perpendicularly connected between the first and second plates 31, 32. In other embodiments, some partitions 33 are connected to the first plate 31 at a predetermined angle, some are connected to the second plate 32 at a predetermined angle, and some are perpendicularly connected between the first and second plates 31, 32.

[0048] It should be noted that the heat dissipation method of the heat sink 3 is not limited, as long as it can achieve heat dissipation. In some embodiments, a fan is provided within the battery pack 100, and the air blown by the fan flows along the multiple sub-heat dissipation channels 34, thereby dissipating the heat generated by the battery cells 11. In another embodiment, the multiple sub-heat dissipation channels 34 are provided with pipes, and a cooling medium flows through the pipes, and heat is exchanged through the cooling medium in the pipes to achieve heat dissipation.

[0049] For ease of description, Figure 1 For example, the first direction in FIG. 4 is a split setting. For details, please refer to Figure 5 、 Figure 6 and Figure 7 The box body 4 includes a bottom plate 41, two first side plates 42 arranged opposite to each other along a first direction, and two first end plates arranged opposite to each other along a second direction. In the actual installation process, please refer to Figure 5 , one of the first end plates is fixed on the base, multiple battery cell groups 10 and heat sink 3 are assembled and placed on the base, and the other first end plate is fixed on the base, see Figure 6 , applying a squeezing force along the second direction so that the two first end plates can be tightly abutted against the multiple battery cell groups 10. By squeezing the first end plates, after the battery pack 100 is installed, the first end plates still maintain the squeezing force on the multiple battery cell groups 10, thereby resisting the expansion force generated by the battery cell groups 10, so that the battery cell groups 10 can be tightly abutted against the box body 4 along the second direction. Figure 7Then, the two first side panels 42 are respectively installed on opposite sides of the bottom panel 41 along the first direction. A compressive force is applied to the two first side panels 42 along the first direction, so that the two first side panels 42 are tightly abutted against the multiple battery cell groups 10. By compressing the first side panels 42, after the battery pack 100 is installed, the first side panels 42 still maintain the compressive force on the multiple battery cell groups 10, thereby resisting the expansion force generated by the battery cell groups 10, so that the battery cell groups 10 can be tightly abutted against the box body 4 along the first direction. In this way, the multiple battery cell groups 10 can be tightly abutted against the box body 4.

[0050] See also Figure 2 The first side plate 42 includes a third plate 421 and a heat conducting plate 422. The heat conducting plate 422 is disposed on a side of the third plate 421 near the battery cell group 10. A plurality of heat dissipating fins 423 are disposed on the side of the heat conducting plate 422 facing the third plate 421. The plurality of heat dissipating fins 423 are connected to the third plate 421. In this embodiment, the heat conducting plate 422 contacts the plurality of battery cells 11, absorbing heat generated by the battery cells 11. The plurality of heat conducting plates 422 transfer the heat to the heat dissipating fins 423, which then transfer the heat to the third plate 421, thereby dissipating the heat to the external environment.

[0051] Furthermore, in order to improve the heat dissipation efficiency, multiple first heat dissipation holes a are provided on the bottom plate 41, the two first end plates and the two first side plates 42. The multiple first heat dissipation holes a are used to discharge the heat generated by the multiple battery cells 11, thereby improving the heat dissipation efficiency of the battery pack 100.

[0052] In some embodiments, a second heat dissipation channel 411 is formed in the base plate 41, and the second heat dissipation channel 411 is connected to multiple sub-heat dissipation channels 34. Multiple first heat dissipation holes a are formed on the channel wall of the second heat dissipation channel 411, and the multiple first heat dissipation holes a are used to discharge heat from the second heat dissipation channel 411 and the multiple sub-heat dissipation channels 34.

[0053] See also Figure 2 The box cover 2 includes a cover body 24 and a mica board 25. The mica board 25 is arranged on the cover body, and the overflow groove 20 is formed on the cover body 24. One function of the mica board 25 is to isolate heat transfer when thermal runaway occurs to prevent the thermal runaway from worsening. Another function is to cover the overflow groove 20 to prevent the electrolyte from being ejected with excessive ejection force and flowing out of the overflow groove 20.

[0054] Furthermore, a plurality of second heat dissipation holes b are formed on the box cover 2, and the plurality of second heat dissipation holes b are used to discharge heat and improve the heat dissipation efficiency of the battery pack 100. Furthermore, the plurality of second heat dissipation holes b and the overflow groove 20 are staggered to avoid interference between the two.

[0055] It should be noted that the formation method of the overflow groove 20 is not limited. The overflow groove 20 can be formed on the side of the box cover 2 away from the accommodating cavity, or on the side of the box cover 2 close to the accommodating cavity. Figure 3 An overflow groove 20 is formed on the side of the box cover away from the accommodating groove. Compared with another setting method, the setting method of this embodiment is simpler and does not require an additional sealing plate structure for packaging to avoid heat spread.

[0056] In addition, the present invention also provides an electrical device, which includes the aforementioned battery pack 100. The specific structure of the battery pack 100 is referenced from the above embodiments. Since the present electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be detailed here.

[0057] It is understood that the electric devices include, but are not limited to, electric toys, electric tools, battery-powered vehicles, cars, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft. Cars may include gasoline-powered cars, gas-powered cars, and new energy vehicles.

[0058] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A battery pack, characterized in that: include: A box body (4), wherein a receiving cavity is formed in the box body (4); A battery cell group (10) is arranged in the accommodating cavity and includes a plurality of battery cells (11), each of the battery cells (11) being provided with an explosion-proof valve (111); and A box cover (2) is provided on the box body (4) to cover the accommodating cavity. At least one overflow groove (20) is integrally formed on the box cover (2), and the overflow groove (20) can be communicated with the explosion-proof valve (111).

2. The battery pack according to claim 1, wherein: A plurality of communication holes (211) are formed on the bottom (21) of the overflow trough (20), and the plurality of communication holes (211) are arranged at intervals along the extension direction of the overflow trough (20), and each communication hole (211) corresponds to the explosion-proof valve (111) of each battery cell (11).

3. The battery pack according to claim 1, wherein: The overflow trough (20) has a first trough wall (22) and a second trough wall (23) arranged opposite to each other along its extension direction; an outlet (221) is formed on the first trough wall (22); and the outlet (221) is arranged through the box cover (2).

4. The battery pack according to claim 3, wherein: In the direction from the second groove wall (23) to the first groove wall (22), the thickness of the groove bottom (21) of the overflow groove (20) is gradually reduced.

5. The battery pack according to claim 2, wherein: An annular boss (212) is provided at one end of each communicating hole (211) facing away from the explosion-proof valve (111).

6. The battery pack according to claim 1, wherein: The box body (4) comprises a base plate (41), a first side plate (42) and a first end plate (43) which are separately arranged. The first side plate (42) is connected to one side of the base plate (41), and the first end plate (43) is connected to one end of the base plate (41) to squeeze the battery cell group (10).

7. The battery pack according to claim 6, characterized in that: The first side plate (42) comprises a third plate body (421) and a heat conducting plate (422), wherein the heat conducting plate (422) is arranged on a side of the third plate body (421) close to the battery cell group, and a plurality of heat dissipating fins (423) are arranged on a side of the heat conducting plate (422) facing the third plate body (421), and the plurality of heat dissipating fins (423) are connected to the third plate body (421).

8. The battery pack according to any one of claims 1 to 7, characterized in that: The battery cell group (10) comprises a plurality of sub-battery cell groups (1), the plurality of sub-battery cell groups (1) are arranged in an array, and a heat dissipation plate (3) is provided between two adjacent sub-battery cell groups (1); Each of the sub-cell groups (1) includes a plurality of the cells (11).

9. The battery pack according to claim 8, characterized in that: Each of the heat dissipation plates (3) comprises a first plate body (31), a second plate body (32) and a plurality of partitions (33); the first plate body (31) and the second plate body (32) are arranged opposite to each other and connected to form a first heat dissipation channel; the plurality of partitions (33) are connected between the first plate body (31) and the second plate body (32) to separate the first heat dissipation channel into a plurality of sub-heat dissipation channels (34).

10. The battery pack according to any one of claims 1 to 7, characterized in that: A plurality of second heat dissipation holes (b) are formed on the box cover (2), and the plurality of second heat dissipation holes (b) are staggered with the overflow groove (20).

11. The battery pack according to any one of claims 1 to 7, characterized in that: The overflow groove (20) is formed on the side of the box cover (2) facing away from the accommodating cavity.

12. An electrical device, characterized in that: Comprising a battery pack (100) as claimed in any one of claims 1 to 11.

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