A battery and a battery pack

Abstract

The utility model discloses a battery and battery pack, through setting the containing piece in the body of bottom support plate, and because the melting point of containing piece is higher, so when the thermal runaway or the temperature of electric core rises, even if the body melts, containing piece can keep shape, and the electric core plays the supporting effect, avoids the electric core to fall to the bottom surface of shell, and then avoids the electric core to cause extrusion to the body after melting, further avoids the body after melting to infiltrate to the electric core, guarantees the normal discharge of gas, thereby reduces further damage.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more particularly to a battery and battery pack. Background Technology

[0002] With the continuous development of new energy battery technology, battery safety performance is receiving increasing attention. Battery covers are typically equipped with explosion-proof valves. When gas is generated inside the battery due to abnormal operation, the gas can be released through the explosion-proof valve to prevent major safety accidents. Currently, to rationally plan the venting channel, the explosion-proof valve can be placed on the bottom surface of the casing, and a base plate can be installed between the bottom surface of the casing and the battery cell to support the cell. However, in the event of thermal runaway, the base plate is prone to melting. After losing the support of the base plate, the battery cell will fall onto the bottom surface of the casing and compress the molten base plate material. This compressed and melted base plate material may seep into the battery cell, causing venting blockage and resulting in poor venting. Utility Model Content

[0003] This utility model provides a battery and battery pack to solve the problem of venting blockage caused by the seepage of molten base plate material into the battery cell.

[0004] In a first aspect, this utility model provides a battery, including: a housing, and a battery cell, a bottom support plate, and an explosion-proof valve located within the housing. The housing is a receiving cavity with an opening at one end, and the battery cell and the bottom support plate are both disposed within the receiving cavity. The bottom surface of the housing has a pressure relief hole, the explosion-proof valve closes the pressure relief hole, and the bottom support plate is disposed between the explosion-proof valve and the battery cell.

[0005] The base plate includes a body and an inclusion member, which is located within the body and has a melting point higher than that of the body.

[0006] Secondly, this utility model provides a battery pack, including: a housing and a battery as described in the first aspect above, the battery being disposed within the housing.

[0007] The beneficial effects of this utility model are as follows:

[0008] This utility model provides a battery and battery pack. By providing an inclusion member inside the body of the base plate, and because the inclusion member has a high melting point, even if the body melts in the event of thermal runaway or cell temperature rise, the inclusion member can maintain its shape and support the cell, preventing the cell from falling to the bottom of the casing. This prevents the cell from squeezing the melted body and further prevents the melted body from seeping into the cell, ensuring the normal discharge of gas and reducing further damage. Attached Figure Description

[0009] Figure 1This is a three-dimensional structural diagram of the battery provided in the embodiment of this utility model;

[0010] Figure 2 This is a cross-sectional view of the battery provided in an embodiment of the present utility model;

[0011] Figure 3 This is a three-dimensional structural diagram of the base plate provided in the embodiment of this utility model;

[0012] Figure 4 For along Figure 3 The cross-sectional view shown by the dashed line x1 in the figure;

[0013] Figure 5 This is a three-dimensional structural diagram of the included component provided in the embodiments of this utility model;

[0014] Figure 6 This is a schematic diagram of the battery pack provided in an embodiment of the present utility model.

[0015] Figure label:

[0016] 10-Shell, 11-Pressure relief hole, 12-Opening, 20-Battery cell, 30-Bottom support plate, 31-Body, 32-Including component, 40-Explosion-proof valve, b0-Bottom surface, d1-First distance, d2-Thickness of bottom support plate, d3-Thickness of including component, T0-Through hole, 110-Box, 120-Battery. Detailed Implementation

[0017] The specific embodiments of a battery and battery pack provided by this utility model will be described in detail below with reference to the accompanying drawings. It should be noted that the described embodiments are only some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] This utility model embodiment provides a battery, such as Figures 1 to 5 As shown, the battery may include: a housing 10, and a battery cell 20, a bottom support plate 30, and an explosion-proof valve 40 located within the housing 10. The housing 10 is a receiving cavity with an opening 12 at one end, and the battery cell 20 and the bottom support plate 30 are both disposed within the receiving cavity. The bottom surface b0 of the housing 10 has a pressure relief hole 11, which is closed by the explosion-proof valve 40. The bottom support plate 30 is disposed between the explosion-proof valve 40 and the battery cell 20, such that the bottom support plate 30 is located between the bottom surface b0 of the housing 10 and the battery cell 20, and can support the battery cell 20. It should be understood that in Figure 3 In the middle, the upper surface of the bottom support plate 30 is the surface of the bottom support plate 30 facing the battery cell 20, and the lower surface of the bottom support plate 30 is the surface of the bottom support plate 30 facing the explosion-proof valve 40.

[0019] The base plate 30 includes a body 31 and an inclusion member 32. The inclusion member 32 is disposed within the body 31, and its melting point is higher than that of the body 31. Because the inclusion member 32 has a higher melting point, even if the body 31 melts in the event of thermal runaway or a rise in the temperature of the battery cell 20, the inclusion member 32 can maintain its shape and support the battery cell 20, preventing the battery cell 20 from falling onto the bottom surface b0 of the housing 10. This also prevents the battery cell 20 from compressing the melted body 31 and further prevents the melted body 31 from seeping into the battery cell 20. It also provides space for heat and gas to escape, ensuring the normal discharge of gas and reducing further damage.

[0020] There is a first distance d1 between the inclusion member 32 and the side surface of the base plate 30 facing the battery cell 20. The first distance d1 can be zero, so that part of the structure in the inclusion member 32 is exposed on the side surface of the base plate 30 facing the battery cell 20. The manufacturing process of this structure may include: drilling a hole in a block of material with the same size as the base plate 30 and the same material as the body 31 to form the body 31, and then embedding the inclusion member 32 into the hole to form a base plate 30 with the inclusion member 32 inside.

[0021] Alternatively, the first distance d1 is greater than 0 and less than or equal to 1 mm. Further, the first distance d1 is 0.5 mm to 1 mm, such that the inclusion member 32 is embedded within the body 31, and the inclusion member 32 is not exposed on the side of the bottom support plate 30 facing the battery cell 20. The first distance d1 can be any value among 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, or 0.5 mm to 1 mm. The manufacturing process of this structure may include: first forming the inclusion member 32, then forming the body 31 using an injection molding process, and adding the inclusion member 32 during injection molding. If the first distance d1 is too large, the thickness d2 of the base plate 30 will increase, compressing the space for the battery cell 20 inside the casing 10 and reducing the capacity density. Furthermore, if the thickness d2 of the base plate 30 remains constant, the thickness d3 of the inclusion member 32 will be too small, reducing the support for the battery cell 20 and decreasing the venting space between the battery cell 20 and the bottom surface b0 of the casing 10. Therefore, setting the first distance d1 to the aforementioned range ensures a high battery capacity density, provides sufficient support for the battery cell 20, and increases venting space. Additionally, setting the first distance d1 to be greater than 0 eliminates the need for the drilling process when manufacturing the base plate 30, preventing burrs on the surface of the base plate 30 facing the battery cell 20 and thus improving battery reliability.

[0022] Optionally, the orthographic projection of the component 32 on the bottom surface b0 of the housing 10 does not overlap with the pressure relief hole 11. Figure 3In the diagram, the position indicated by the dotted circle x2 is the position corresponding to the pressure relief hole 11. This can effectively prevent the inclusion member 32 from blocking the pressure relief hole 11 when the body 31 melts, thereby preventing heat and gas from being unable to be discharged through the pressure relief hole 11, and thus preventing the battery from suffering more serious damage in thermal runaway.

[0023] Alternatively, the orthographic projection of the inclusion member 32 on the bottom surface b0 of the housing 10 may partially overlap with the pressure relief hole 11 (not shown in the figure), but they cannot completely overlap. That is, the inclusion member 32 cannot completely cover the pressure relief hole 11. Although this will block part of the pressure relief hole 11, the unblocked pressure relief hole 11 can still discharge heat and gas. However, compared with the case without overlap, the amount of heat and gas discharged will be relatively less, but it can still prevent the battery from suffering more serious damage in thermal runaway to a certain extent.

[0024] Along the thickness direction of the base plate 30, such as the z-direction, the inclusion member 32 has a through hole T0, and there may be one, two or more through holes T0. Figure 3 and Figure 5 The illustration uses one through-hole T0 as an example, but in practice, more through-holes T0 can be provided. When there are multiple through-holes T0, their arrangement can follow certain rules or be arbitrary, depending on the actual situation, and is not specifically limited here. The diameter of each through-hole T0 can also be set according to the actual situation, and is not specifically limited here. In this way, the through-holes T0 provide a channel for gas to escape from the housing 10. When the body 31 melts and the inclusion member 32 supports the cell 20, the heat and gas emitted from the surface of the cell 20 toward the inclusion member 32 can be discharged through the through-holes T0, reserving gas passage space in case of thermal runaway, increasing the heat and gas discharge channels, and thus preventing more severe damage to the battery in the event of thermal runaway.

[0025] The cross-sectional shape of the component 32 can be I-shaped, such as... Figure 4 and Figure 5As shown, the cross-section of the inclusion member 32 can be a surface perpendicular to the large surface of the battery and the bottom surface b0 of the casing 10. The large surface of the battery refers to the surface parallel to the plane formed by the x and z directions, and the bottom surface b0 of the casing 10 is parallel to the plane formed by the x and y directions. The cross-section of the inclusion member 32 is parallel to the plane formed by the y and z directions. In this way, the I-shaped inclusion member 32 can reduce the first distance d1, thereby increasing the battery's capacity density. The I-shaped inclusion member 32 can also provide venting space when the body 31 melts and the inclusion member 32 supports the cell 20, allowing heat and gas emitted from the surface of the cell 20 facing the inclusion member 32 to be discharged. This provides venting space in case of thermal runaway, further increasing the heat and gas discharge channels and thus preventing more severe damage to the battery in the event of thermal runaway. Of course, the cross-sectional shape of the inclusion member 32 can also be other shapes, such as, but not limited to, a grid shape, which can be set according to actual needs.

[0026] The inclusion member 32 can be a single component (not shown in the figure). In this case, the inclusion member 32 can be located at the middle position of the bottom of the housing 10. When the body 31 melts and the inclusion member 32 supports the battery cell 20, the inclusion member 32 can be located at the center of the battery cell 20, thereby enabling the battery cell 20 to be relatively balanced. Alternatively, multiple inclusion members 32 can be provided, with each inclusion member 32 spaced apart, such as... Figure 3 As shown, this provides a more balanced support force when supporting the battery cell 20, preventing the battery cell 20 from shifting and causing further damage. Furthermore, at least some of the components 32 are symmetrically arranged along the length direction (i.e., the x-direction) of the bottom surface b0 of the housing 10, which provides a more uniform support force to the battery cell 20, thereby improving the reliability of the battery.

[0027] Optionally, the melting point of the inclusion element 32 can be greater than 500°C, while the melting point of the body 31 is usually less than 300°C. For example, when the body 31 is made of polypropylene, its melting point is 160°C to 170°C; when the body 31 is made of low-density polyethylene, its melting point is 105°C to 115°C; and when the body 31 is made of polyester, its melting point is 250°C to 260°C. This allows the melting point of the inclusion element 32 to be higher than that of the body 31, so that the inclusion element 32 can still maintain its shape when the body 31 melts. The inclusion element 32 can provide support for the battery cell 20, thereby improving the reliability of the battery.

[0028] The inclusion component 32 may include modified phenolic resin or ceramics, which typically have high melting points. For example, the melting point of modified phenolic resin is 800℃~1500℃, and the melting point of ceramics is 1500℃~2500℃. This allows the inclusion component 32 to maintain its shape even when the main body 31 melts. The inclusion component 32 can support the battery cell 20 and improve the reliability of the battery.

[0029] Based on the same inventive concept, this utility model embodiment also provides a battery pack, such as... Figure 6 As shown, the battery pack may include: a housing 110 and a battery 120 as described in the present invention embodiment, wherein the battery 120 is disposed inside the housing 110.

[0030] Of course, in addition to the housing 110 and the battery 120, the battery pack may also include other structures, such as, but not limited to, a battery management system and a charging / discharging interface. The specific configuration can be set according to actual needs, and no specific limitations are made here.

[0031] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A battery, characterized in that, include: The enclosure comprises a housing, a battery cell, a bottom support plate, and an explosion-proof valve located within the housing. The housing is a receiving cavity with an opening at one end, and the battery cell and the bottom support plate are both disposed within the receiving cavity. The bottom surface of the housing has a pressure relief hole, the explosion-proof valve closes the pressure relief hole, and the bottom support plate is disposed between the explosion-proof valve and the battery cell. The base plate includes a body and an inclusion member, the inclusion member being disposed within the body, and the melting point of the inclusion member being higher than that of the body.

2. The battery as described in claim 1, characterized in that, The inclusion member has a first distance from the side surface of the base plate facing the battery cell, the first distance being greater than 0 and less than or equal to 1 mm.

3. The battery as described in claim 1, characterized in that, The orthographic projection of the included element on the bottom surface of the housing does not overlap with the pressure relief hole.

4. The battery as described in claim 1, characterized in that, Along the thickness direction of the base plate, the inclusion member has a through hole.

5. The battery as described in claim 1, characterized in that, The cross-sectional shape of the included component is I-shaped.

6. The battery as claimed in claim 1, characterized in that, The inclusion element is provided in multiple ways, and the inclusion elements are arranged at intervals.

7. The battery as described in claim 6, characterized in that, At least some of the included components are arranged symmetrically along the length of the bottom surface of the housing.

8. The battery according to any one of claims 1-7, characterized in that, The melting point of the component is greater than 500°C.

9. The battery according to any one of claims 1-8, characterized in that, The inclusion element includes modified phenolic resin or ceramic.

10. A battery pack, characterized in that, include: The housing and the battery as described in any one of claims 1-9, wherein the battery is disposed within the housing.

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