A battery pack

Abstract

The utility model provides a kind of battery pack, including first battery group, second battery group and pressure relief device, first battery group includes multiple first battery monomer, second battery group includes multiple second battery monomer, first explosion-proof valve is provided on each first battery monomer, second explosion-proof valve is provided on each second battery monomer;Pressure relief device includes pressure relief cavity, multiple first pressure relief part and second pressure relief part, first explosion-proof valve and first pressure relief part are set one by one, second explosion-proof valve and second pressure relief part are set one by one;First explosion-proof valve and second explosion-proof valve are misaligned, and the vertical distance between first explosion-proof valve and second explosion-proof valve is h, the horizontal distance between adjacent two first explosion-proof valves is d, the horizontal distance of first explosion-proof valve and second explosion-proof valve misalignment is d, 190mm 2 ≤h*d≤1500mm 2 The battery pack can effectively reduce the safety risk caused by thermal runaway of the battery, and improve the space utilization of the battery pack.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technology field, especially relate to a battery pack. BACKGROUND

[0002] At the moment of high-speed development of new energy technology, the safety of battery pack has become the key factor restricting the further breakthrough in the field of electric vehicles, energy storage systems, etc.

[0003] At present, part of battery pack adopts the structure that two groups of batteries share the same pressure relief cavity, which realizes the compact utilization of space to a certain extent, but hides a major safety hazard. When any cell in the battery pack abnormally explodes due to internal short circuit, overcharge and overdischarge, etc., it is very easy to impact the corresponding cell in the other battery pack, thereby causing the safety risk of thermal runaway of the battery. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model aims at a battery pack which can not only effectively reduce the safety risk caused by thermal runaway of the battery, but also improve the space utilization of the battery pack.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A battery pack at least includes a first battery pack, a second battery pack and a pressure relief device, the first battery pack is arranged on the upper part of the pressure relief device, the second battery pack is arranged on the lower part of the pressure relief device, the first battery pack includes a plurality of first battery monomers, the second battery pack includes a plurality of second battery monomers, a first wall is arranged on each first battery monomer, a first explosion-proof valve is arranged on the first wall, a second wall is arranged on each second battery monomer, and a second explosion-proof valve is arranged on the second wall.

[0007] The pressure relief device includes a pressure relief cavity, a plurality of first pressure relief parts and second pressure relief parts, the first explosion-proof valve is arranged one by one corresponding to the first pressure relief part, and the second explosion-proof valve is arranged one by one corresponding to the second pressure relief part.

[0008] The first explosion-proof valve and the second explosion-proof valve are arranged in a staggered manner, and the vertical distance between the first explosion-proof valve and the second explosion-proof valve is h, the horizontal distance between the first explosion-proof valve and the second explosion-proof valve is d, 190mm 2 ≤h*d≤1500mm 2 .

[0009] As can be seen from the above technical solutions, when one or more of the first battery cells malfunction due to overcharging, overheating, or internal short circuit, the first explosion-proof valve will automatically open to release the internal high-pressure gas. At this time, under pressure, the first pressure relief section is ruptured, and the high-pressure gas flows into the pressure relief chamber 304 through the first pressure relief section. Similarly, when one or more of the second battery cells malfunction due to overcharging, overheating, or internal short circuit, the second explosion-proof valve will automatically open to release the internal high-pressure gas. At this time, under pressure, the second pressure relief section is ruptured, and the high-pressure gas flows into the pressure relief chamber through the second pressure relief section.

[0010] In the battery pack disclosed in this embodiment of the present invention, when the range of h*d is too small, the first or second battery cell will impact the explosion-proof valve of the opposite battery upon explosion, easily rupturing the explosion-proof valve of the opposite battery and causing the opposite battery to fail. When the range of h*d is too large, it leads to poor space utilization in the vertical and horizontal directions of the battery pack, resulting in low energy density. Therefore, 190mm... 2 ≤h*d≤1500mm 2 The range setting not only prevents the first or second battery cell from impacting the opposite battery during explosion, reducing the safety risks caused by thermal runaway, but also improves the space utilization of the entire battery pack. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the internal structure of the battery pack disclosed in an embodiment of the present utility model from one angle;

[0013] Figure 2 This is a schematic diagram of the internal structure of the battery pack disclosed in another embodiment of the present utility model;

[0014] Figure 3 This is a schematic diagram of the arrangement of the first and second battery packs within the housing according to an embodiment of the present utility model.

[0015] Figure 4 This is a schematic diagram of the arrangement structure of the first explosion-proof valve disclosed in the embodiment of this utility model;

[0016] Figure 5 This is a schematic diagram of the arrangement structure of the second explosion-proof valve disclosed in the embodiment of this utility model;

[0017] Figure 6 This is a schematic diagram of the pressure relief device disclosed in the embodiments of this utility model;

[0018] Figure 7 This is a schematic diagram of the arrangement structure of the support plate disclosed in one embodiment of the present utility model;

[0019] Figure 8 This is a schematic diagram of the outer shell structure of a battery pack disclosed in one embodiment of the present utility model;

[0020] Figure 9 This is a cross-sectional view of a battery pack disclosed in one embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 100. First battery cell; 101. First wall; 1011. First explosion-proof valve;

[0023] 200. Second battery cell; 201. Second wall; 2011. Second explosion-proof valve;

[0024] 300 - Pressure relief device; 301 - First pressure relief plate; 3011 - First pressure relief hole; 302 - Second pressure relief plate; 3021 - Second pressure relief hole; 303 - Support plate; 304 - Pressure relief chamber;

[0025] 400 - Housing; 401 - Pressure relief valve. Detailed Implementation

[0026] In view of this, the purpose of this utility model is to provide a battery pack that can not only effectively reduce the safety risks caused by thermal runaway of the battery, but also improve the space utilization of the battery pack.

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Please refer to... Figures 1 to 9 .

[0028] Please refer to Figures 1-6 , Figure 9The battery pack disclosed in this embodiment of the present invention includes at least a first battery pack, a second battery pack, and a pressure relief device 300. The first battery pack is disposed on the upper part of the pressure relief device 300, and the second battery pack is disposed on the lower part of the pressure relief device 300. The first battery pack includes a plurality of first battery cells 100, and the second battery pack includes a plurality of second battery cells 200. Each first battery cell 100 is provided with a first wall 101, and a first explosion-proof valve 1011 is provided on the first wall 101. Each second battery cell 200 is provided with a second wall 201, and a second explosion-proof valve 2011 is provided on the second wall 201.

[0029] The pressure relief device 300 includes a pressure relief chamber 304, multiple first pressure relief sections and second pressure relief sections, a first explosion-proof valve 1011 corresponding to each of the first pressure relief sections, and a second explosion-proof valve 2011 corresponding to each of the second pressure relief sections. The first explosion-proof valves 1011 and 2011 are offset, with a vertical distance h between them and a horizontal distance d between them, which is 190 mm. 2 ≤h*d≤1500mm 2 .

[0030] As a specific embodiment, the value of h*d disclosed in this utility model embodiment is 190mm. 2 300mm 2 600mm 2 1000mm 2 Or 1300mm 2 .

[0031] When one or more of the first battery cells 100 malfunction due to overcharging, overheating, or internal short circuit, the first explosion-proof valve 1011 will automatically open to release the internal high-pressure gas. At this time, under pressure, the first pressure relief section is ruptured, and the high-pressure gas flows into the pressure relief chamber 304 through the first pressure relief section. Similarly, when one or more of the second battery cells 200 malfunction due to overcharging, overheating, or internal short circuit, the second explosion-proof valve 2011 will automatically open to release the internal high-pressure gas. At this time, under pressure, the second pressure relief section is ruptured, and the high-pressure gas flows into the pressure relief chamber 304 through the second pressure relief section.

[0032] In the battery pack disclosed in this embodiment of the present invention, when the range of h*d is too small, the first battery cell 100 or the second battery cell 200 will impact the explosion-proof valve of the opposite battery upon explosion, easily rupturing the explosion-proof valve of the opposite battery and causing the opposite battery to fail. When the range of h*d is too large, it will result in poor space utilization in the vertical and horizontal directions of the battery pack, and low energy density of the battery pack. Therefore, 190mm 2 ≤h*d≤1500mm2 The range setting not only prevents the first battery cell 100 or the second battery cell 200 from impacting the opposite battery during explosion, reducing the safety risk caused by thermal runaway of the battery, but also improves the space utilization of the entire battery pack.

[0033] The specific locations of the first explosion-proof valve 1011 and the second explosion-proof valve 2011 in this embodiment of the utility model are not limited, as long as they meet the requirements of this utility model. Those skilled in the art can make the settings according to actual needs.

[0034] In one embodiment of this utility model, the first explosion-proof valve 1011 can be disposed in the central region of the first wall 101, and similarly, the second explosion-proof valve 2011 can be disposed in the central region of the second wall 201. This structure is applicable when both the first battery cell 100 and the second battery cell 200 are cylindrical batteries.

[0035] Since the central area is where the internal pressure of the battery is relatively uniform and concentrated, when a large amount of gas and pressure is generated inside the battery due to abnormal conditions such as overcharging, over-discharging, short circuit, or high temperature, the first explosion-proof valve 1011 or the second explosion-proof valve 2011 located in the central area can detect the pressure change more promptly and effectively, and quickly open to release pressure, thus preventing the first battery cell 100 and / or the second battery cell 200 from exploding or rupturing due to excessive internal pressure. Moreover, when the first explosion-proof valve 1011 or the second explosion-proof valve 2011 opens to release pressure in the central area of ​​the battery, it can also ensure that the internal pressure of the first battery cell 100 and / or the second battery cell 200 is released uniformly in all directions.

[0036] As a further embodiment, the battery pack disclosed in this utility model embodiment has a 200mm diameter. 2 ≤h*d≤1500mm 2 By setting h*d within the above range, the space utilization rate of the battery pack can be further guaranteed.

[0037] As a specific example, h*d can be 300 mm. 2 600 mm 2 Or 1000mm 2 .

[0038] In another embodiment of this utility model, the first explosion-proof valve 1011 disclosed in this embodiment is disposed in the eccentric region of the first wall 101, and similarly, the second explosion-proof valve 2011 is disposed in the eccentric region of the second wall 201. This structure is applicable when both the first battery cell 100 and the second battery cell 200 are prismatic batteries.

[0039] As a further embodiment, the battery pack disclosed in this utility model embodiment is 190 mm2 ≤h*d≤1480mm 2 With this setting, h*d is placed within the above range, which can further improve the space utilization of the battery pack.

[0040] As a specific example, h*d can be 500 mm. 2 800 mm 2 Or 1300mm 2 .

[0041] As a further embodiment, the battery pack disclosed in this utility model embodiment has a first reinforcing rib on the first explosion-proof valve 1011. This arrangement can improve the overall strength of the first explosion-proof valve 1011 and prevent premature breakage before reaching the designed opening pressure, thus avoiding malfunction or safety hazards.

[0042] Correspondingly, the second explosion-proof valve 2011 is provided with a second reinforcing rib. This design can improve the overall strength of the second explosion-proof valve 2011 and prevent premature breakage before reaching the design opening pressure, which could lead to malfunction or safety hazards.

[0043] As a further embodiment, the first explosion-proof valve 1011 disclosed in this utility model embodiment is provided with a first protective patch, wherein the first protective patch can block sharp objects from scratching or colliding with the first explosion-proof valve 1011, and at the same time prevent external impact from causing deformation or damage to the first explosion-proof valve 1011. During battery production, transportation and use, it provides physical protection for the first explosion-proof valve 1011, thereby maintaining its structural integrity and functional stability.

[0044] Accordingly, the second explosion-proof valve 2011 disclosed in this utility model embodiment is provided with a second protective patch, wherein the second protective patch can block sharp objects from scratching or colliding with the second explosion-proof valve 2011, and at the same time prevent external impact from causing deformation or damage to the second explosion-proof valve 2011. During battery production, transportation and use, it provides physical protection for the second explosion-proof valve 2011, thereby maintaining its structural integrity and functional stability.

[0045] The present invention does not limit the specific structure of the first pressure relief part and the second pressure relief part. Any structure that meets the requirements of the present invention is within the protection scope of the present invention.

[0046] As a specific embodiment of this utility model, the pressure relief device disclosed in this embodiment includes a first pressure relief plate 301 and a second pressure relief plate 302. The first pressure relief part includes a first pressure relief hole 3011 formed on the first pressure relief plate 301 and a first mica sheet blocking the first pressure relief hole 3011. The first mica sheet, through its material strength and thickness design, forms a pressure blocking threshold for the first pressure relief hole 3011. When the internal pressure of the first battery cell 100 exceeds the withstand strength of the mica sheet, the mica sheet will precisely rupture, causing the first pressure relief hole 3011 to open and release pressure.

[0047] Correspondingly, the second pressure relief section includes a second pressure relief hole 3021 formed on the second pressure relief plate 302, and a second mica sheet sealing the second pressure relief hole 3021. The second mica sheet, through its material strength and thickness design, forms a pressure sealing threshold for the second pressure relief hole 3021. When the internal pressure of the second battery cell 200 exceeds the withstand strength of the mica sheet, the mica sheet will precisely rupture, causing the second pressure relief hole 3021 to open and release pressure.

[0048] As a further embodiment, the thickness of the first mica sheet and the second mica sheet disclosed in this utility model embodiment is 0.2mm-1mm. If the thickness of the first mica sheet and the second mica sheet is too large, it may be impossible for the high-pressure gas to break through. If the thickness of the first mica sheet and the second mica sheet is too small, it may cause abnormal breakage due to slight vibration or compression during transportation or assembly.

[0049] In a specific embodiment, the thickness of the first mica sheet and the second mica sheet can be 0.3 mm, 0.4 mm or 0.5 mm.

[0050] As a further embodiment, the firing temperature of the first mica sheet and the second mica sheet disclosed in this utility model embodiment is both 800℃-1200℃.

[0051] For example, the firing temperature of the first mica sheet and the second mica sheet can both be 800℃, 1000℃ or 1100℃.

[0052] In another specific embodiment of this utility model, the battery pack disclosed in this embodiment does not have a pressure relief hole. Instead, it is processed using only the bodies of the first pressure relief plate 301 and the second pressure relief plate 302. Specifically, the thickness of the first pressure relief portion is set to be less than the thickness of the first pressure relief plate 301, and the thickness of the second pressure relief portion is set to be less than the thickness of the second pressure relief plate 302. This design facilitates pressure relief by breaking through the first pressure relief portion when the first battery cell 100 malfunctions, or by breaking through the second pressure relief portion when the second battery cell 200 malfunctions.

[0053] As a further embodiment, the first pressure relief part disclosed in this utility model embodiment is further provided with a first pressure relief mark, and the second pressure relief part is further provided with a second pressure relief mark. This arrangement makes it easier for high-pressure gas to break through the first pressure relief part or the second pressure relief part.

[0054] The first and second pressure relief marks can be various shapes and structures such as circular, semi-circular, or radiating. This embodiment of the present invention does not limit these shapes and structures, and those skilled in the art can choose according to actual needs.

[0055] The specific shapes of the first and second pressure relief parts are not limited in this embodiment of the utility model. Any structure that meets the requirements of this utility model is within the protection scope of this utility model.

[0056] In one embodiment of this utility model, the first pressure relief part disclosed in this embodiment is circular, and the area of ​​the first pressure relief part is smaller than the area of ​​the first wall 101; correspondingly, the second pressure relief part is circular or square, and the area of ​​the second pressure relief part is smaller than the area of ​​the first wall 101. This configuration allows it to be adapted to either the first battery cell 100 or the second battery cell 200.

[0057] As a further embodiment, please refer to Figure 7 and Figure 8 The pressure relief device 300 disclosed in this embodiment of the present invention further includes a support plate 303, which is disposed between the first pressure relief plate 301 and the second pressure relief plate 302, and is connected to the first pressure relief plate 301 and the second pressure relief plate 302 respectively. The support plate 303 enhances the overall connection strength of the pressure relief device 300.

[0058] Please refer to Figure 8 The battery pack disclosed in this embodiment of the present utility model also includes a housing 400, and the first battery pack, the second battery pack and the pressure relief device 300 are all disposed in the housing 400. The first pressure relief plate 301 and the second pressure relief plate 302 are both connected to the housing 400.

[0059] The housing 400 is equipped with a pressure relief valve 401. The pressure relief valve 401 is connected to the pressure relief chamber 304. After the first battery cell 100 and the second battery cell 200 are depressurized, they enter the pressure relief chamber 304 and finally the high-pressure gas is discharged through the pressure relief valve 401.

[0060] It should be noted that the range of h is 18mm-45mm, for example, h is specifically 20mm, 30mm or 40mm; the range of d is 10mm-35mm, for example, d is specifically 15mm, 20mm or 30mm.

[0061] When h is too small, the first battery cell 100 or the second battery cell 200 will impact the opposite battery when it explodes, easily breaking the explosion-proof valve of the opposite battery and causing it to fail. When h is too large, it will result in poor space utilization of the battery pack in the vertical direction. When d is too small, the first battery cell or the second battery cell will impact the explosion-proof valve of the opposite battery when it explodes, causing it to fail. When d is too large, it will result in poor space utilization of the battery pack in the horizontal direction.

[0062] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0063] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0064] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, characterized in that, It includes at least a first battery pack, a second battery pack, and a pressure relief device. The first battery pack is disposed on the upper part of the pressure relief device, and the second battery pack is disposed on the lower part of the pressure relief device. The first battery pack includes a plurality of first battery cells, and the second battery pack includes a plurality of second battery cells. Each first battery cell is provided with a first wall and a first explosion-proof valve is provided on the first wall. Each second battery cell is provided with a second wall and a second explosion-proof valve is provided on the second wall. The pressure relief device includes a pressure relief chamber, a plurality of first pressure relief parts and second pressure relief parts, and the first explosion-proof valve is provided in a one-to-one correspondence with the first pressure relief part, and the second explosion-proof valve is provided in a one-to-one correspondence with the second pressure relief part; The first explosion-proof valve and the second explosion-proof valve are offset from each other, with a vertical distance h between them and a horizontal distance d between them, which is 190mm. 2 ≤h*d≤1500mm 2 .

2. The battery pack according to claim 1, characterized in that, The first explosion-proof valve is located in the central area of ​​the first wall; The second explosion-proof valve is located in the central area of ​​the second wall.

3. The battery pack according to claim 2, characterized in that, 200mm 2 ≤h*d≤1500mm 2 。 4. The battery pack according to claim 1, characterized in that, The first explosion-proof valve is located in the eccentric region of the first wall; The second explosion-proof valve is located in the eccentric region of the second wall.

5. The battery pack according to claim 4, characterized in that, 190 mm 2 ≤h*d≤1480 mm 2 。 6. The battery pack according to claim 1, characterized in that, The first explosion-proof valve is provided with a first reinforcing rib; The second explosion-proof valve is provided with a second reinforcing rib.

7. The battery pack according to claim 1, characterized in that, The first explosion-proof valve is provided with a first protective patch; The second explosion-proof valve is equipped with a second protective patch.

8. The battery pack according to claim 1, characterized in that, The pressure relief device includes a first pressure relief plate and a second pressure relief plate. The first pressure relief part includes a first pressure relief hole opened on the first pressure relief plate and a first mica sheet blocking the first pressure relief hole. The second pressure relief part includes a second pressure relief hole formed on the second pressure relief plate, and a second mica sheet that blocks the second pressure relief hole.

9. The battery pack according to claim 8, characterized in that, The thickness of both the first mica sheet and the second mica sheet is 0.2mm-1mm.

10. The battery pack according to claim 8, characterized in that, The firing temperature of both the first mica sheet and the second mica sheet is 800℃-1200℃.

11. The battery pack according to claim 8, characterized in that, The thickness of the first pressure relief part is less than the thickness of the first pressure relief plate, and the thickness of the second pressure relief part is less than the thickness of the second pressure relief plate.

12. The battery pack according to claim 11, characterized in that, The first pressure relief part is also provided with a first pressure relief mark, and the second pressure relief part is also provided with a second pressure relief mark.

13. The battery pack according to claim 1, characterized in that, The first pressure relief part is a circular structure, and the area of ​​the first pressure relief part is smaller than the area of ​​the first wall; The second pressure relief part has a circular or square structure, and the area of ​​the second pressure relief part is smaller than the area of ​​the first wall.

14. The battery pack according to claim 8, characterized in that, The pressure relief device further includes a support plate, which is disposed between the first pressure relief plate and the second pressure relief plate, and is connected to the first pressure relief plate and the second pressure relief plate respectively.

15. The battery pack according to claim 8, characterized in that, It also includes a housing, in which the first battery pack, the second battery pack and the pressure relief device are all disposed, and the first pressure relief plate and the second pressure relief plate are both connected to the housing; The housing is equipped with a pressure relief valve, which is connected to the pressure relief chamber.

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