A battery and battery pack
By adjusting the ratio of the carrier plate to the cell surface area s1/s2 to 0.8 to 1.5, the battery design was optimized, the electrode overlap problem caused by carrier plate compression was solved, and the reliability and safety of the battery were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CALB GROUP CO LTD
- Filing Date
- 2025-06-10
- Publication Date
- 2026-06-30
AI Technical Summary
In existing batteries, the carrier plate may squeeze the cell, causing the positive and negative electrode plates to overlap, reducing the battery's reliability and safety.
By controlling the ratio of the carrier plate to the cell surface area s1/s2 to be 0.8 to 1.5, the area ratio of the carrier plate to the cell is optimized to ensure that the exhaust space and extrusion pressure are moderate and to avoid electrode overlap.
It improves battery reliability and safety, reduces the chance of electrode material loss and overlap of positive and negative electrodes, and enhances venting performance.
Smart Images
Figure CN224437887U_ABST
Abstract
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 typically feature explosion-proof valves. When gas is generated internally due to abnormal battery operation, the gas can be released through the explosion-proof valve to prevent major safety accidents. Currently, to optimize the venting path, the explosion-proof valve can be placed on the bottom surface of the casing, with a carrier plate placed between the bottom surface of the casing and the battery cell. This carrier plate supports the battery cell. However, the carrier plate may compress the battery cell, potentially causing the positive and negative electrode plates within the cell to overlap, resulting in a short circuit and reduced battery reliability and safety. Utility Model Content
[0003] This utility model provides a battery and battery pack to improve the reliability and safety of the battery.
[0004] In a first aspect, this utility model provides a battery, including: a casing and a battery cell, wherein the casing is a receiving cavity with an opening at one end, and the battery cell is disposed in the receiving cavity; the bottom surface of the casing has an exhaust channel;
[0005] The battery also includes: a carrier plate and an explosion-proof valve. The explosion-proof valve seals the exhaust channel, and the carrier plate is located between the explosion-proof valve and the battery cell.
[0006] Wherein, s1 / s2 is 0.8 to 1.5, s1 represents the area of the carrier plate surface facing the cell, and s2 represents the area of the cell surface facing the carrier plate.
[0007] 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.
[0008] The beneficial effects of this utility model are as follows:
[0009] This utility model provides a battery and battery pack. If s1 / s2 is too small, or s1 is too small and s2 is too large, it indicates that the area of the first surface of the carrier plate facing the cell is too small, and the area of the second surface of the cell facing the carrier plate is too large. Because the area of the first surface is too small, the space between the carrier plate and the side of the casing will be relatively large, providing more exhaust space for the flow of gas and heat. However, if the area of the second surface is too large, it will cause the extrusion force on the side of the cell facing the carrier plate to increase, which may cause the electrode in the cell to fall off or the positive and negative electrode in the cell to overlap. If s1 If s1 / s2 is too large, it may be due to s1 being too large and s2 being too small. This indicates that the area of the first surface of the carrier plate facing the cell is too large, and the area of the second surface of the cell facing the carrier plate is too small. Since the area of the first surface is too large, it will reduce the venting space. The area of the second surface is too small, it will reduce the extrusion force on the side of the cell facing the carrier plate, and reduce the probability of the positive and negative electrode plates in the cell overlapping. Therefore, setting s1 / s2 to 0.8 to 1.5 can not only obtain more venting space, but also avoid electrode material falling out of the cell and the positive and negative electrode plates overlapping in the cell, thereby improving the reliability and safety of the battery. Attached Figure Description
[0010] Figure 1 This is a three-dimensional structural diagram of the battery provided in the embodiment of this utility model;
[0011] Figure 2 This is a cross-sectional view of a carrier plate provided in an embodiment of the present utility model;
[0012] Figure 3 This is a cross-sectional view of another carrier plate provided in an embodiment of this utility model;
[0013] Figure 4 This is a schematic diagram of the structure of a battery pack provided in an embodiment of the present utility model.
[0014] Figure label:
[0015] 10-Housing, 11-Exhaust channel, 12-Opening, 20-Battery cell, 30-Carrier plate, 31-Through hole, 40-Explosion-proof valve, 50-Supporting component, b0-Bottom surface of housing, b1-Side surface of housing, m1-First surface, m2-Second surface, 110-Box, 120-Battery. Detailed Implementation
[0016] 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.
[0017] This utility model embodiment provides a battery, such as Figures 1 to 3 As shown, the battery may include: a housing 10 and a cell 20. The housing 10 is a receiving cavity with an opening 12 at one end, and the cell 20 is disposed in the receiving cavity; the bottom surface b0 of the housing 10 has an exhaust channel 11.
[0018] The battery may also include: a carrier plate 30 and an explosion-proof valve 40, wherein the explosion-proof valve 40 seals the exhaust passage 11, and the carrier plate 30 is disposed between the explosion-proof valve 40 and the battery cell 20.
[0019] Wherein, s1 / s2 is 0.8 to 1.5, where s1 represents the area of the surface of the carrier plate 30 facing the cell 20, and s2 represents the area of the surface of the cell 20 facing the carrier plate 30. For simplicity, the surface of the carrier plate 30 facing the cell 20 can be referred to as the first surface m1, and the surface of the cell 20 facing the carrier plate 30 can be referred to as the second surface m2. It should be understood that when s1 / s2 is 0.8 to 1.5, s1 / s2 can specifically be any value among 0.8, 1.0, 1.2, 1.3, 1.5, or 0.8 to 1.5, depending on the actual situation.
[0020] Among them, Figure 2 In the enlarged schematic diagram within the dashed box 1, the carrier plate 30 and the battery cell 20 are actually in contact. Here, they are separated only for ease of indicating the first surface m1 and the second surface m2, but this does not mean that the carrier plate 30 and the battery cell 20 are actually separated. Similarly, in Figure 3 In the enlarged schematic diagram within the dashed coil 3, the carrier plate 30 and the battery cell 20 are separated to facilitate the indication of the first surface m1 and the second surface m2. However, this does not mean that the carrier plate 30 and the battery cell 20 are actually separated.
[0021] Thus, if s1 / s2 is too small, or s1 is too small and s2 is too large, it indicates that the area of the first surface m1 of the carrier plate 30 facing the cell 20 is too small, and the area of the second surface m2 of the cell 20 facing the carrier plate 30 is too large. Because the area of the first surface m1 is too small, the space between the carrier plate 30 and the side b1 of the housing 10 will be relatively large, providing more exhaust space for the flow of gas and heat. However, the area of the second surface m2 is too large, which will cause the extrusion pressure on the side of the cell 20 facing the carrier plate 30 to increase. This may cause the electrode in the cell 20 to fall off or the positive and negative electrode in the cell 20 to overlap. If s1 / s2 is too large, If s1 is too large and s2 is too small, it indicates that the area of the first surface m1 of the carrier plate 30 facing the cell 20 is too large, and the area of the second surface m2 of the cell 20 facing the carrier plate 30 is too small. Since the area of the first surface m1 is too large, it will reduce the venting space. The area of the second surface m2 is too small, it will reduce the extrusion force on the side of the cell 20 facing the carrier plate 30, and reduce the probability of the positive and negative electrode plates in the cell 20 overlapping. Therefore, setting s1 / s2 within the above range can not only obtain more venting space, but also avoid electrode material falling out of the cell 20 and the positive and negative electrode plates overlapping in the cell 20, thereby improving the reliability and safety of the battery.
[0022] Furthermore, s1 / s2 can be set to 1.1 to 1.3. For example, s1 / s2 can be any value among 1.1, 1.2, 1.3, or 1.1 to 1.3, depending on the actual situation. This can further optimize the reliability and safety of the battery.
[0023] The battery cell 20 can be a wound cell or a laminated cell. Regardless of whether the cell 20 is wound or laminated, it includes a positive electrode, a negative electrode, and a separator between the positive and negative electrodes. Taking a laminated cell as an example, the area of the positive electrode is usually smaller than that of the negative electrode, and the area of the negative electrode is smaller than that of the separator. Therefore, after stacking the positive electrode, negative electrode, and separator, the separators at the edges of the cell 20 will be connected together, thereby achieving insulation between the positive and negative electrodes.
[0024] When the cell 20 is assembled into the housing 10, the separator is relatively soft. The separator on the second surface m2 of the cell 20 facing the carrier plate 30 will be squeezed and compressed, which will shorten the distance between the edge of the positive electrode and the second surface m2 and the edge of the negative electrode and the second surface m2. As a result, the exhaust space between the positive electrode and the separator will become smaller and the exhaust space between the negative electrode and the separator will become smaller. Furthermore, the compression of the separator may cause the electrode in the cell 20 to fall off and the positive and negative electrodes in the cell 20 to overlap.
[0025] In this embodiment of the invention, by controlling s1 / s2, that is, controlling the area ratio of the first surface m1 and the second surface m2, the compression of the separator can be reduced, ensuring the exhaust space between the positive electrode, the negative electrode and the separator, preventing overlap caused by the compression of the separator, thereby improving the safety and reliability of the battery.
[0026] Furthermore, for wound cells, due to the characteristics of the wound structure, the positive electrode, negative electrode, and separator are pressed more tightly, resulting in good separator support, high cell strength, and a relatively large separator extension beyond the positive and negative electrode sheets. Consequently, the deformation of the separator due to compression during assembly is relatively small. For stacked cells, due to the characteristics of the stacked structure, the positive electrode, negative electrode, and separator are pressed more loosely, resulting in poorer separator support, relatively lower cell strength, and a relatively smaller separator extension beyond the positive and negative electrode sheets. Consequently, the deformation of the separator due to compression during assembly is relatively large. Therefore, when adjusting s1 / s2, the type of cell 20 can also be considered to optimize battery performance.
[0027] Optionally, s1 is greater than s2, such as Figure 2 As shown, the area of the first surface m1 is greater than the area of the second surface m2, indicating that the second surface m2 of the cell 20 facing the carrier plate 30 is completely supported by the carrier plate 30. This makes the support of the carrier plate 30 for the cell 20 more uniform, thereby reducing the compression on the diaphragm of the cell 20 facing the carrier plate 30. The distance d1 between the carrier plate 30 and the side b1 of the housing 10 can be set to 0.5mm to 3mm. For example, d1 can be any value among 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3mm, or 0.5mm to 3mm, depending on the actual situation. Adjusting d1 increases the space between the carrier plate 30 and the side b1 of the housing 10, thereby increasing the exhaust space and allowing gas and heat to flow more easily to the exhaust channel 11, thus improving the exhaust effect.
[0028] Alternatively, s1 is less than or equal to s2, such as Figure 3As shown, the area of the first surface m1 is less than or equal to the area of the second surface m2. This indicates that a portion of the second surface m2 of the battery cell 20 facing the carrier plate 30 is supported by the carrier plate 30, while a portion of the second surface m2 is not supported by the carrier plate 30 and is suspended. Thus, the diaphragm on the side of the battery cell 20 facing the carrier plate 30 is compressed, while the exhaust space at the uncompressed diaphragm is unaffected. The distance d2 between the battery cell 20 and the side b1 of the housing 10 can be set from 1.2mm to 3.7mm. For example, d2 can be any value from 1.2mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 3.7mm, or 1.2mm to 3.7mm, depending on the actual situation. Adjusting d2 increases the space between the battery cell 20 and the side b1 of the housing 10, thereby increasing the exhaust space and allowing gas and heat to flow more easily to the exhaust channel 11, thus improving the exhaust effect.
[0029] Optionally, the thickness d3 of the carrier plate 30 can be set to 0.5mm to 2.5mm. For example, d3 can be any value among 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, or 0.5mm to 2.5mm, depending on the actual situation. The larger the thickness d3 of the carrier plate 30, the smaller the remaining space reserved for assembling the battery cell 20, and the greater the compressive force on the battery cell 20; the smaller the thickness d3 of the carrier plate 30, the easier it is for the battery cell 20 to contact the rounded corners of the housing 10 after assembly (e.g., ...). Figure 3 As shown in the dashed circle 2 in the figure, this leads to a short circuit between the cell 20 and the casing 10. Therefore, by setting the thickness d3 of the carrier plate 30 within the above range, the pressure on the cell 20 can be reduced, and the short circuit between the cell 20 and the casing 10 can be avoided, thereby improving the manufacturing yield and reliability of the battery.
[0030] The hardness of the carrier plate 30 can be set to 5–25 HV. For example, the hardness of the carrier plate 30 can be any value among 5 HV, 10 HV, 15 HV, 20 HV, 25 HV, or 5–25 HV, depending on the actual situation. Since the main function of the carrier plate 30 is to support the battery cell 20, the greater the hardness of the carrier plate 30, the better the support effect on the battery cell 20. However, to achieve a higher hardness, it is necessary to add a material with higher hardness to the carrier plate 30 or design the carrier plate 30 with a special structure, which will increase the manufacturing cost and complicate the manufacturing process. Conversely, the lower the hardness of the carrier plate 30, the worse the support effect on the battery cell 20, but the manufacturing cost and manufacturing process may be reduced. Therefore, setting the hardness of the carrier plate 30 within the above range can provide a good support effect for the battery cell 20, reduce manufacturing costs, and simplify the manufacturing process.
[0031] Optionally, the carrier plate 30 may have a through hole 31, the orthographic projection of the through hole 31 onto the bottom surface b0 of the housing 10 overlapping with the exhaust channel 11, that is, the through hole 31 and the exhaust channel 11 are correspondingly arranged. In this way, when the cell 20 releases gas and heat on the side facing the carrier plate 30, the gas and heat can flow directly to the exhaust channel 11 through the through hole 31, which can accelerate the discharge of gas and heat, thereby further improving the safety and reliability of the battery.
[0032] One through hole 31 can be provided, such as Figure 2 As shown; or, multiple through holes 31 can be provided, such as Figure 3 As shown, at least some of these through holes 31 can correspond to the exhaust channel 11, thereby accelerating the discharge of gas and heat. In specific implementations, the number and distribution of the through holes 31 can be set according to actual needs and are not limited here.
[0033] Optionally, the battery may also include a support member 50 disposed between the carrier plate 30 and the bottom surface b0 of the housing 10. The support member 50 can support the carrier plate 30 and form a gas guiding space between the carrier plate 30 and the bottom surface b0 of the housing 10, so that gas and heat can flow to the exhaust channel 11 more easily and improve the exhaust effect.
[0034] The support member 50 and the carrier plate 30 can be integrally formed, which increases the strength and stability of the overall structure formed by the support member and the carrier plate 30, thereby increasing the stability of the support for the battery cell 20. Alternatively, the support member 50 and the carrier plate 30 can be two independent structures, which results in slower heat conduction between the support member 50 and the carrier plate 30, thereby reducing the deformation of the support member 50 and the carrier plate 30, and thus increasing the stability of the support for the battery cell 20.
[0035] Furthermore, the number and distribution of the support components 50 can be set according to actual needs and are not limited to... Figure 2 and Figure 3 As shown, there are no restrictions this time.
[0036] Based on the same inventive concept, this utility model embodiment also provides a battery pack, such as... Figure 4 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.
[0037] 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.
[0038] 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 housing and the battery cell are provided, wherein the housing is a receiving cavity with an opening at one end, and the battery cell is disposed in the receiving cavity; the bottom surface of the housing has an exhaust channel. The battery further includes: a carrier plate and an explosion-proof valve, wherein the explosion-proof valve seals the exhaust channel, and the carrier plate is disposed between the explosion-proof valve and the battery cell; Wherein, s1 / s2 is 0.8 to 1.5, s1 represents the area of the surface of the carrier plate facing the cell, and s2 represents the area of the surface of the cell facing the carrier plate.
2. The battery as described in claim 1, characterized in that, The ratio of s1 / s2 is 1.1 to 1.
3.
3. The battery as described in claim 1, characterized in that, s1 is greater than s2.
4. The battery as described in claim 3, characterized in that, The distance between the carrier plate and the side of the housing is 0.5mm to 3mm.
5. The battery as described in claim 1, characterized in that, s1 is less than or equal to s2.
6. The battery as described in claim 5, characterized in that, The distance between the battery cell and the side of the casing is 1.2mm to 3.7mm.
7. The battery as claimed in claim 1, characterized in that, The thickness of the carrier plate is 0.5mm to 2.5mm.
8. The battery as claimed in claim 1, characterized in that, The hardness of the carrier plate is 5-25 HV.
9. The battery according to any one of claims 1-8, characterized in that, The carrier plate has a through hole, and the orthographic projection of the through hole onto the bottom surface of the housing overlaps with the exhaust channel.
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.