Batteries and powered devices

Abstract

Provided is a battery and an electric power-using device, the battery including a housing, a battery module located within the housing, and a pressure release passage; the battery module includes at least one battery cell, each battery cell being provided with a first pressure release means; the housing is provided with a second pressure release means; the pressure release passage connects the first pressure release means and the second pressure release means of the at least one battery cell; when activated, the first pressure release means is used to release exhaust generated inside the battery cell to the pressure release passage; the pressure release passage is used to direct the exhaust to the second pressure release means; and when activated, the second pressure release means is used to release the exhaust in the pressure release passage to the outside of the housing; and at least one of the battery cell, the battery module, the housing, and the pressure release passage is provided with a filter member having filter holes for preventing particulate matter in the exhaust from passing through, thereby reducing high-temperature particulate matter ejected from the battery and improving the reliability of battery use.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to a Chinese patent application filed with the China Patent Office on June 7, 2023, bearing application number 202310675424.7 and entitled "Battery and Power-Using Device," the entire contents of which are incorporated herein by reference.

[0002] This application relates to the technical field of battery reliability, and more particularly to batteries and power-using devices. [Background technology]

[0003] Batteries are widely used in various electronic devices such as mobile phones, laptops, battery cars, electric vehicles, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, and power tools. Batteries can include nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, and secondary alkaline zinc-manganese batteries.

[0004] In the development of battery technology, apart from studying battery performance, how to improve the reliability of batteries during use has also become one of the research focuses.

[0005] The preceding discussion is merely intended to provide background information related to the present application and does not necessarily constitute prior art. Summary of the Invention

[0006] The embodiments of the present application aim to improve the reliability of battery usage by providing a battery and a power-using device.

[0007] The technical solutions adopted in the embodiments of this application are as follows:

[0008] In a first aspect, an embodiment of the present application provides a battery, the battery including a housing, a battery module located within the housing, and a pressure release passage, the battery module including at least one battery cell, each battery cell being provided with a first pressure release means, the housing including a second pressure release means, the pressure release passage connecting the first pressure release means and the second pressure release means of the at least one battery cell, the first pressure release means being used to release effluent generated inside the battery cell to the pressure release passage when activated, the pressure release passage being used to direct the effluent to the second pressure release means, the second pressure release means being used to release effluent from the pressure release passage to the outside of the housing, and at least one of the battery cell, the battery module, the housing, and the pressure release passage being provided with a filter member having filter holes for preventing particulate matter in the effluent from passing through.

[0009] In the battery of the embodiment of the present application, when thermal runaway occurs in a battery cell within the battery, the first pressure release means is activated, and the exhaust generated in the battery cell passes through the first pressure release means and is released into the pressure release passage and moves along the pressure release passage to the second pressure release means. As the thermal runaway continues to intensify, the second pressure release means is activated, and the exhaust in the pressure release passage passes through the second pressure release means and is released to the outside of the housing. During this process, a filter element is provided in at least one of the battery cell, battery module, housing, and pressure release passage, so that the passage of high-temperature particulate matter in the exhaust can be prevented through the filter holes in the filter element, reducing the amount of high-temperature particulate matter ejected from the battery. This reduces the risk of the battery's exhaust temperature becoming too high and helps improve the reliability of battery use.

[0010] In some embodiments, when the filtering member is provided in the battery cell, the first pressure release means and the filtering member are an integrated structure, or the filtering member is connected to the case of the battery cell; when the filtering member is provided in the housing, the second pressure release means and the filtering member are an integrated structure, or the filtering member is connected to the housing; or a filtering hole is provided in the side wall of the housing, and the portion of the side wall of the housing where the filtering hole is provided forms the filtering member.

[0011] By adopting the technical solution of this embodiment, the filtering element can be flexibly attached to the housing, which makes manufacturing easier.

[0012] In some embodiments, when a filter member is provided in the housing, a filter member is provided on the side of the second pressure release means facing the battery module to prevent particulate matter released from the battery cells from entering the second pressure release means, and / or a filter member is provided on the side of the second pressure release means facing away from the battery module to prevent particulate matter released from the second pressure release means from passing through.

[0013] By adopting the technical solution of this embodiment, the installation position of the filter element is flexible, which facilitates processing and manufacturing.

[0014] In some embodiments, the sum of the cross-sectional areas of all the filter holes in the filter member is the filtering area; when a filter member is provided on the side of the second pressure release means facing the battery module, the filter member located on the side of the second pressure release means facing the battery module is a first filter member, and the filtering area of ​​the first filter member is larger than the maximum pressure release area of ​​the second pressure release means; when a filter member is provided on the side of the second pressure release means facing away from the battery module, the filter member located on the side of the second pressure release means facing away from the battery module is a second filter member, and the filtering area of ​​the second filter member is smaller than the maximum pressure release area of ​​the second pressure release means.

[0015] By adopting the technical solution of this embodiment, the flow area of ​​the exhaust is reduced along the exhaust path, and the effect of gradually releasing pressure can be achieved, which is helpful in improving the exhaust discharge effect and improving the use reliability of the battery. In addition, the flow area is gradually reduced, which is also helpful in reducing design redundancy and reducing manufacturing costs.

[0016] In some embodiments, when a plurality of first filter members are provided on a side of the second pressure release means facing the battery modules, the plurality of first filter members are arranged in sequence along the discharge path of the exhaust released from the battery cells, and the filtering areas of the plurality of first filter members become smaller along the discharge path of the exhaust; when a plurality of second filter members are provided on a side of the second pressure release means facing away from the pressure release passage, the plurality of second filter members are arranged in sequence along the discharge path of the exhaust released from the second pressure release means, and the filtering areas of the plurality of second filter members become smaller along the discharge path of the exhaust.

[0017] By adopting the technical solution of this embodiment, multi-stage filtration of the discharged material can be realized, which is helpful in reducing the number of particulate matter discharged; at the same time, multi-stage pressure release of the discharged material can also be realized, which improves the discharge effect of the discharged material and helps to improve the use reliability of the battery.

[0018] In some embodiments, when a plurality of first filter members are provided on the side of the second pressure release means facing the battery module, the pore size of the filter holes of the plurality of first filter members becomes smaller along the discharge path of the exhaust, and when a plurality of second filter members are provided on the side of the second pressure release means facing away from the pressure release passage, the pore size of the filter holes of the plurality of second filter members becomes smaller along the discharge path of the exhaust.

[0019] By adopting the technical solution of this embodiment, large particulate matter in the discharge can be filtered first, and then small particles in the discharge. In this way, the stepwise filtration reduces the probability of clogging of the filtering element, reduces the risk of pressure relief not being performed smoothly, and helps to improve the reliability of battery use.

[0020] In some embodiments, the filter element and the second pressure relief means are spaced apart.

[0021] By adopting the technical solution of this embodiment, the risk of interference between the second pressure release means and the filter element can be reduced.

[0022] In some embodiments, the filtering element includes a plate portion and an annular wall portion annularly arranged around the plate portion, one end of the annular wall portion being connected to the plate portion and the other end of the annular wall portion being connected to the housing, the annular wall portion annularly arranged around the second pressure release means, and at least one of the annular wall portion and the plate portion being provided with a filtering hole.

[0023] By adopting the technical solution of this embodiment, the structure of the filter element is simplified, and the processing and manufacturing are simplified.

[0024] In some embodiments, the filtering member has a first filtering section and a second filtering section, each of which has a plurality of filtering holes, and a first exhaust path passing through the filtering holes of the first filtering section and a second exhaust path passing through the filtering holes of the second filtering section are formed between the first pressure release means and the second pressure release means of at least one battery cell, and when the length of the first exhaust path is greater than the length of the second exhaust path, the pore diameter of the filtering holes of the first filtering section is greater than the pore diameter of the filtering holes of the second filtering section.

[0025] By adopting the technical solution of this embodiment, the pore diameter of the filter holes of the first filter unit is larger than the pore diameter of the filter holes of the second filter unit. In this way, the low-temperature small particles in the exhaust flowing through the long exhaust path pass directly through the filter holes of the first filter unit and are discharged outside the battery. The filter holes of the first filter unit also block the large particles with high temperatures in the exhaust. Meanwhile, the large and small particles with high temperatures in the exhaust flowing through the short exhaust path are not discharged outside the battery but are all blocked by the filter holes of the second filter unit. This reduces the risk of the battery's exhaust temperature becoming too high and improves the reliability of battery use. In addition, the combined design of filter holes of different sizes allows the exhaust to be quickly discharged outside the battery, reducing the risk of pressure building up inside the casing.

[0026] In some embodiments, the number of filter holes is plural, and any two filter holes have the same pore size, or at least two filter holes have different pore sizes.

[0027] By adopting the technical solution of this embodiment, the pore size of the filter holes can be flexibly set, which facilitates processing and manufacturing.

[0028] In some embodiments, the cross-sectional area of ​​the largest filter hole is S, and the length of the shortest vent path between the first pressure release means and the second pressure release means of at least one battery cell is L, where:

number

[0029] By adopting the technical solutions of the embodiments,

number

[0030] In some embodiments, the cross-sectional area of ​​the largest filter hole is S, and the shortest exhaust path between the first pressure release means and the second pressure release means of any one battery cell is L, where:

number

[0031] By adopting the technical solution of this embodiment, the shortest discharge path of each battery cell and the cross-sectional area of ​​the filter hole with the largest pore diameter of the filter member are both within a reasonable design range, which further improves the reliability of battery use.

[0032] In some embodiments,

number

[0033] By adopting the technical solution of this embodiment, the cross-sectional area of ​​the filter hole with the largest pore diameter in the filter member and the shortest exhaust path of the battery cell are more reasonably designed, the risk of the battery exhaust temperature becoming too high is reduced, and the battery usage reliability is higher.

[0034] In some embodiments,

number

[0035] By adopting the technical solution of this embodiment, the length of the shortest exhaust path is within this range, so that the shortest exhaust path is not designed to be too short, which would shorten the cooling time of the granules and make the temperature of the granules discharged from the battery high, which would easily cause the deterioration of the external environment of the battery; and the shortest exhaust path is not designed to be too long, which would prolong the discharge time of the discharged material and cause the pressure to be released in a timely manner, which would seriously damage the casing.

[0036] In some embodiments, the volumetric energy density of the battery is E, and the cross-sectional area of ​​the largest pore size filter hole is S, where:

number

[0037] By adopting the technical solutions of the embodiments,

number

[0038] In some embodiments,

number

[0039] By adopting the technical solution of this embodiment, the cross-sectional area of ​​the filter pore with the largest pore diameter of the filter member and the volumetric energy density of the battery can be designed more reasonably, the risk of the exhaust temperature of the battery becoming too high is reduced, and the use reliability of the battery is improved.

[0040] In some embodiments,

number

[0041] By adopting the technical solution of this embodiment, the volumetric energy density E of most batteries is within the above range, so the above formula can be applied to most batteries and has a wide range of application.

[0042] In some embodiments,

number

[0043] By adopting the technical solution of this embodiment, the cross-sectional area S of the filter hole with the largest pore diameter is within the above range, and the filter element can effectively block most of the high-temperature particulate matter, thereby reducing the risk of the battery's exhaust temperature becoming too high.

[0044] In some embodiments,

number

[0045] By adopting the technical solution of this embodiment, the cross-sectional area of ​​the filter hole with the largest pore diameter can be more reasonably designed, which can further reduce the risk of the exhaust temperature of the battery becoming too high.

[0046] In some embodiments, the pressure release passage further includes a first sub-pressure release passage for connecting to the second pressure release means, and the battery further includes a partition for separating the battery module from the first sub-pressure release passage, the partition having a plurality of first air-permeable structures, each of which connects the first pressure release means of at least one battery cell to the first sub-pressure release passage.

[0047] By adopting the technical solution of this embodiment, when a battery cell in a battery module experiences thermal runaway, the waste released from the first pressure release means of the battery cell will enter the first pressure release passage through the first breathable structure. However, the first pressure release passage and the battery module are separated by a partition, which reduces the risk of contact between the waste in the first pressure release passage and other battery cells in the battery module, thereby reducing the risk of thermal runaway spreading and helping to improve the reliability of battery use.

[0048] In some embodiments, the pressure release passage includes at least two first sub-pressure release passages, each connected to a first breathable structure corresponding to a different battery cell, and the first sub-pressure release passages are separated by a spacing element.

[0049] By adopting the technical solution of this embodiment, when thermal runaway occurs in one of the battery cells, the waste released from the battery cell will enter the first sub-pressure release passage connected to the battery cell, and the first sub-pressure release passages are separated by spacing elements, so that the waste cannot directly enter other first sub-pressure release passages, which helps reduce the risk of thermal runaway spreading.

[0050] In some embodiments, the pressure release passage further includes a communication passage, which is formed by being surrounded by the wall surface of the partition and the inner wall surface of the housing, and each first sub-pressure release passage is connected to the second pressure release means via the communication passage.

[0051] By adopting the technical solution of this embodiment, the connecting passage adopts a communicating passage formed by being surrounded by the wall surface of the partition and the inner wall surface of the housing, which has a simple structure and is easy to process and manufacture.

[0052] In some embodiments, the battery module includes at least one row of battery cells, each row of battery cells including at least one battery cell, and each row of battery cells is provided with at least one corresponding first sub-pressure release passage, each first sub-pressure release passage extends along the arrangement direction of the corresponding row of battery cells, and each first air-permeable structure corresponding to the battery cells in each row is connected to the corresponding first sub-pressure release passage.

[0053] By adopting the technical solution of this embodiment, when thermal runaway occurs in a battery cell, the waste material released from the battery cell will enter the corresponding first sub-pressure release passage and be discharged, and the waste material will not enter other first sub-pressure release passages and will not come into contact with other battery cells, thereby reducing the risk of thermal runaway spreading and improving the reliability of the battery cells.

[0054] In some embodiments, the second pressure relief means is located on the side of the end of the battery module along the extension direction of the first sub-pressure relief passage.

[0055] By adopting the technical solution of this embodiment, when the battery cell experiences thermal runaway, the exhaust in the first sub-pressure release passage can be quickly discharged to the second pressure release means, thereby achieving a high pressure release and exhaust effect for the battery.

[0056] In some embodiments, the communication passage is an annular passage extending around the partition.

[0057] By adopting the technical solution of this embodiment, the exhaust discharged from the first sub-pressure release passage enters the annular passage and flows through the annular passage, thus extending the exhaust path of the exhaust and lengthening the cooling time of the particulate matter in the exhaust, and reducing the risk of the battery's exhaust temperature becoming too high due to the discharge of the particulate matter outside the battery.

[0058] In some embodiments, at least one row of battery cells is provided at both ends with end plates inserted into the annular passage and sealed to the inner wall surface of the housing, and the pressure release passage further includes a second sub-pressure release passage intersecting the first sub-pressure release passage, and the second sub-pressure release passage is used to connect the corresponding first sub-pressure release passage to the annular passage.

[0059] By adopting the technical solution of this embodiment, the exhaust released from the battery cell must flow through the first sub-pressure release passage, the second sub-pressure release passage and the annular passage to the second pressure release means, and finally be discharged outside the battery. In this way, the exhaust discharge path can be extended, the cooling time of the particulate matter in the exhaust can be extended, and the risk of the battery's exhaust temperature becoming too high can be reduced.

[0060] In some embodiments, end plates are provided on both ends of each row of battery cells, and each first sub-pressure relief passage communicates with a second sub-pressure relief passage.

[0061] By adopting the technical solution of this embodiment, when thermal runaway occurs in any one of the battery cells, the released waste materials pass through the corresponding first sub-pressure release passage and second sub-pressure release passage and flow into the annular passage, then flow through the annular passage to the second pressure release means, and are released to the outside of the battery through the second pressure release means, which helps to improve the reliability of battery use.

[0062] In some embodiments, the pressure relief passage includes a plurality of second sub-pressure relief passages, the second sub-pressure relief passages being separated by spacing elements.

[0063] By adopting the technical solution of this embodiment, through the design of multiple second sub-pressure relief passages, the exhaust in the first sub-pressure relief means can be discharged through multiple second sub-pressure relief passages, which allows the exhaust to be discharged quickly, reduces the risks of pressure accumulation inside the housing, excessively high temperatures, etc., and helps improve the usage reliability of the battery.

[0064] In some embodiments, the plurality of second sub-pressure relief passages are arranged at intervals in the extension direction of the first sub-pressure relief passage.

[0065] By adopting the technical solution of this embodiment, the battery cells arranged in the extension direction of the first sub-pressure release passage can quickly discharge the waste material released from the battery cells into the annular passage through the corresponding second sub-pressure release passage, and finally discharge it to the outside of the housing through the second pressure release means, thereby reducing the risks of pressure accumulation and excessively high temperatures inside the housing and helping to improve the reliability of battery use.

[0066] In some embodiments, the first sub-pressure relief passage and the second sub-pressure relief passage are perpendicular.

[0067] By adopting the technical solution of this embodiment, the first sub-pressure relief passage and the second sub-pressure relief passage are regularly distributed, which facilitates processing and manufacturing.

[0068] In some embodiments, the annular passage is provided with an annular member connected to the housing, the annular member is used to divide the annular passage into a first sub-annular passage and a second sub-annular passage arranged around the first sub-annular passage, the annular member is provided with a second breathable structure for connecting the first sub-annular passage and the second sub-annular passage, the second sub-annular passage is connected to a second pressure release means, and the first sub-annular passage is connected to the first sub-pressure release passage.

[0069] By adopting the technical solution of this embodiment, the exhaust released from the battery cell needs to pass through the first sub-annular passage and the second sub-annular passage, which can extend the exhaust path of the exhaust, prolong the cooling time of the particulate matter in the exhaust, reduce the risk of the battery's exhaust temperature becoming too high, and help improve the use reliability of the battery.

[0070] In some embodiments, the second breathable structure is a perforation.

[0071] According to the technical solution of this embodiment, the second air-permeable structure is a through-hole, which has a simple structure and is easy to process and manufacture.

[0072] In some embodiments, the annular member comprises at least three sidewalls connected in series, the sidewall closest to the second pressure release means being provided with a second breathable structure.

[0073] By adopting the technical solution of this embodiment, the second breathable structure is close to the second pressure release means, so that the discharged matter passing through the second breathable structure can quickly move to the second pressure release means and be discharged through the second pressure release means, which is advantageous in preventing the risk of pressure accumulation inside the housing and helps to improve the reliability of battery use.

[0074] In some embodiments, when a filtering member is provided in the housing, the side wall portion close to the second pressure release means serves as the filtering member, and the filtering holes serve as the second breathable structure.

[0075] By adopting the technical solution of this embodiment, a filter hole can be directly opened in the side wall portion close to the second pressure release means, thereby realizing the filtration of the discharged matter and realizing the communication between the first sub-annular passage and the second sub-annular passage. The annular member and the filter member are integrated, which simplifies the structure and makes it easy to process and manufacture.

[0076] In some embodiments, the annular member comprises at least three sidewalls connected in series, the sidewall remote from the second pressure release means being provided with a second breathable structure.

[0077] By adopting the technical solution of this embodiment, the second breathable structure is far from the second pressure release means, so that the exhaust that passes through the second breathable structure only needs to travel a certain distance to reach the second pressure release means and be discharged from the housing. In this way, the discharge path of the exhaust can be extended, the cooling time of the granular matter in the exhaust can be extended, the temperature of the granular matter discharging into the housing can be lowered, and the risk of the battery's exhaust temperature becoming too high can be reduced, which is helpful in improving the reliability of battery use.

[0078] In some embodiments, the side wall portion closer to the second pressure release means is a first side wall portion, and at least one of the side wall portion adjacent to the first side wall portion and the side wall portion opposite the first side wall portion is provided with a second breathable structure.

[0079] By adopting the technical solution of this embodiment, the second breathable structure is designed to be separated from the second pressure release means, which can extend the discharge path of the discharged material, prolong the cooling time of the particulate matter in the discharged material, and help reduce the risk of the battery's exhaust temperature becoming too high.

[0080] In some embodiments, the second breathable structure is located centrally in the corresponding sidewall portion.

[0081] By adopting the technical solution of this embodiment, the second ventilation structure is located in the center of the side wall, so that the distance from the battery cells located at both ends to the second ventilation structure is not too far. In this way, waste materials released from the battery cells located at the ends can be quickly discharged, which helps to improve the reliability of battery use.

[0082] In some embodiments, when a filtering member is provided in the housing, the side wall remote from the second pressure release means serves as the filtering member, and the filtering holes serve as the second breathable structure.

[0083] By adopting the technical solution of this embodiment, a filter hole can be directly opened in the side wall portion away from the second pressure release means, thereby realizing the filtration of the discharged matter and realizing the communication between the first sub-annular passage and the second sub-annular passage. The annular member and the filter member are integrated, which simplifies the structure and makes it easy to process and manufacture.

[0084] In some embodiments, when the filtering member is provided in the housing, the filtering member is provided to cover the second breathable structure.

[0085] By adopting the technical solution of this embodiment, the filter element is arranged to cover the second breathable structure, which simplifies the structure and facilitates processing and manufacturing.

[0086] In some embodiments, the filtering member is located between the battery module and the second pressure release means, and the filtering member has a first filtering section and a second filtering section, and both the first filtering section and the second filtering section are provided with a plurality of filtering holes. A first exhaust path passing through the filtering holes of the first filtering section and a second exhaust path passing through the filtering holes of the second filtering section are formed between the first pressure release means and the second pressure release means of the battery cell closest to the second pressure release means, and when the length of the first exhaust path is longer than the length of the second exhaust path, the hole diameter of the filtering holes of the first filtering section is larger than the hole diameter of the filtering holes of the second filtering section.

[0087] By adopting the technical solution of this embodiment, the pore diameter of the filter holes of the first filter unit is larger than that of the second filter unit, so that the low-temperature small particles in the exhaust flowing through the long exhaust path pass directly through the filter holes of the first filter unit and are discharged outside the battery, and the filter holes of the first filter unit also block the high-temperature large particles in the exhaust. Furthermore, the high-temperature large and small particles in the exhaust flowing through the short exhaust path are not discharged outside the battery but are all blocked by the filter holes of the second filter unit, thereby reducing the risk of the battery's exhaust temperature becoming too high and improving the reliability of battery use. In addition, the combined design of filter holes of different sizes allows the exhaust to be quickly discharged outside the battery and reduces the risk of pressure building up inside the casing.

[0088] In some embodiments, the housing further includes a bottom plate, the divider is supported on the bottom plate by a spacing element, the battery module is located above the divider, and the first pressure release means is located at the bottom of the battery cell.

[0089] By adopting the technical solution of this embodiment, the first pressure release means is located at the bottom of the battery cell, and at the same time, the battery module and the first sub-pressure release means are separated by a partition, so that the waste released from the first pressure release means is unlikely to come into contact with the electrical components at the top of the battery cell, which reduces the risk of damage to the battery cell and helps improve the reliability of battery use.

[0090] In some embodiments, the divider is a thermal management member for providing heat exchange with the battery modules.

[0091] According to the technical solution of the embodiment, the partition itself is a thermal management member, thus eliminating the need for additional members, which helps to reduce the number of parts in the battery and facilitates processing and manufacturing.

[0092] In a second aspect, an embodiment of the present application provides a power-using device including the battery of any of the above embodiments.

[0093] The above has outlined the technical solution of the present application. In order to make the technical solution of the present application more clearly understood and implemented according to the content of the specification, and to make the above and other objectives, features and advantages of the present application more comprehensible, specific embodiments of the present application are specifically set forth below. [Brief explanation of the drawings]

[0094] In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly describe the drawings used in the description of the embodiments or exemplary technologies. Of course, the drawings described below are only a part of the embodiments of the present application, and those skilled in the art can come up with other drawings based on these drawings without any creative efforts.

[0095] In order to more clearly describe the technical solutions in the embodiments of the present application, the following briefly describes the drawings used in the description of the embodiments or prior art. Of course, the drawings described below are only a part of the embodiments of the present application, and those skilled in the art can conceive of other drawings based on these drawings without any creative efforts.

[0096] [Figure 1] 1 is a structural schematic diagram of an electric power-using device provided in an embodiment of the present application; [Figure 2] 1 is a structural schematic diagram of a battery provided in accordance with an embodiment of the present application; [Figure 3] 1 is a structural schematic diagram of a battery cell provided by an embodiment of the present application; [Figure 4] FIG. 2 is an exploded schematic view of a battery provided in accordance with another embodiment of the present application. [Figure 5] 5 is a structural schematic diagram of a portion of one viewing angle of the filtering member of the battery shown in FIG. 4. FIG. [Figure 6] 5 is a structural schematic diagram of a part of the filtering member of the battery shown in FIG. 4 at another viewing angle. [Figure 7] FIG. 5 is a structural schematic diagram of one viewing angle of the battery shown in FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along the line AA in FIG. [Figure 9] FIG. 8 is a cross-sectional view taken along the line BB in FIG. [Figure 10] FIG. 9 is a partial enlarged view of part C in FIG. 8. [Figure 11] FIG. 9 is a partial enlarged view of part D in FIG. 8. [Figure 12] 5 is a structural schematic diagram of the battery shown in FIG. 4 at another viewing angle. [Figure 13] FIG. 13 is a cross-sectional view taken along line EE in FIG. [Figure 14] FIG. 2 is a structural schematic diagram of a battery provided by yet another embodiment of the present application. [Figure 15] FIG. 15 is a cross-sectional view taken along the line FF in FIG. [Figure 16] FIG. 16 is a cross-sectional view taken along line GG in FIG. [Figure 17] FIG. 2 is a structural schematic diagram of a battery provided by yet another embodiment of the present application. [Figure 18] FIG. 18 is a cross-sectional view taken along line HH in FIG. [Figure 19] FIG. 19 is a partial enlarged view of part I in FIG. [Figure 20] FIG. 19 is a partial enlarged view of part J in FIG. [Figure 21] FIG. 19 is a partial enlarged view of part K in FIG. [Figure 22] FIG. 18 is a cross-sectional view of the battery shown in FIG. [Figure 23] FIG. 2 is a structural schematic diagram of a battery provided by yet another embodiment of the present application. [Figure 24] FIG. 24 is a cross-sectional view taken along line MM in FIG. 23. [Figure 25] FIG. 24 is a cross-sectional view of the battery shown in FIG. 23. [Figure 26] 1A to 1C are structural schematic diagrams of several types of battery cells provided by the embodiments of the present application. [Figure 27] FIG. 2 is an exploded schematic view of a battery provided in accordance with yet another embodiment of the present application. [Figure 28] FIG. 28 is a structural schematic diagram of the battery shown in FIG. 27 after the top cover has been hidden. [Figure 29] FIG. 28 is a cross-sectional view of the battery shown in FIG. 27. [Figure 30] FIG. 2 is an exploded schematic view of a battery provided in accordance with yet another embodiment of the present application. [Figure 31] FIG. 31 is a structural schematic diagram of the battery shown in FIG. 30 after the top cover has been hidden. [Figure 32] FIG. 31 is a cross-sectional view of the battery shown in FIG. 30. [Figure 33] FIG. 10 is a structural schematic diagram of a battery provided according to yet another embodiment of the present application after the top cover is hidden. [Figure 34] FIG. 10 is a structural schematic diagram of a battery provided according to yet another embodiment of the present application after the top cover is hidden. [Figure 35] FIG. 2 is an exploded schematic view of a battery provided in accordance with yet another embodiment of the present application. [Figure 36] FIG. 36 is a structural schematic diagram of the battery shown in FIG. 35 after the top cover has been hidden. [Figure 37] FIG. 36 is a cross-sectional view of the battery shown in FIG. 35. [Figure 38] FIG. 2 is an exploded schematic view of a battery provided in accordance with yet another embodiment of the present application. [Figure 39] FIG. 39 is a cross-sectional view of the battery shown in FIG. 38. [Figure 40] FIG. 39 is a cross-sectional view of the battery shown in FIG. 38. [Explanation of symbols]

[0097] The symbols in the figure are as follows: 1000 vehicle; 1100 battery; 1200 controller; 1300 motor; 10 housing; 11 first portion; 12 second portion; 13 top cover; 14 frame; 15 bottom plate; 16 second pressure release means; 141 pressure release hole; 101 first exhaust passage; 102 second exhaust passage; 20 battery module; 21 battery cell; 211 case; 212 end plate; 213 electrode assembly; 214 electrode terminal; 214a positive electrode terminal; 214b negative electrode terminal; 215 first pressure release means; 22 end plate; 30 pressure release passage; 31 first sub-pressure release passage; 32 communication passage; 33 annular passage; 34 second sub-pressure release passage; 331 first sub-annular passage; 332 second sub-annular passage; 40 filtering member; 41 plate portion; 42 annular wall portion; 43 First filtering section; 44 Second filtering section; 401 Filter hole; 50 Partition; 51 First breathable structure; 60 Spacing element; 70 Annular member; 71 Second breathable structure; 72 Side wall portion; 73 First side wall portion; 80 Enclosure member. DETAILED DESCRIPTION OF THE INVENTION

[0098] Hereinafter, the embodiments of the present application will be described in detail, and illustrative examples of the embodiments are shown in Figures 1 to 40, and the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to Figures 1 to 40 are illustrative and are intended only to interpret the present application, and should not be construed as limiting the present application.

[0099] In describing this application, it should be understood that orientations or positional relationships indicated by terms such as "length," "width," "up," "down," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," etc., are based on the drawings and are intended merely to facilitate and simplify the description of this application, and should not be construed as limiting this application, as they do not expressly or imply that the devices or elements described necessarily have, or are configured or operated in, a particular orientation.

[0100] Additionally, the terms "first" and "second" are for descriptive purposes only and should not be understood as expressing or implying relative importance or the number of technical features shown. Thus, a feature qualified as "first" or "second" expressly or implies the inclusion of one or more of that feature. In the description of this application, unless expressly and specifically limited, "plurality" means two or more than two.

[0101] In this application, unless otherwise clearly defined or limited, the terms "attach," "couple," "connect," "fix," etc. should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral molding, a mechanical connection, an electrical connection, a direct connection, or an indirect connection via an intermediate medium, or a relationship of internal communication between two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to specific circumstances.

[0102] In the description of this application, it should be explained that the term "and / or" is merely used to describe the relation between related objects, and indicates that three kinds of relations can exist. For example, A and / or B can indicate three situations: A exists alone, A and B exist together, and B exists alone.

[0103] In the examples of the present application, the same reference numerals represent the same components or parts, and the same parts in the examples of the present application may be designated by a reference numeral in the drawings, with only one part or member being designated by a reference numeral, and it should be understood that the reference numerals are similarly applied to other identical parts or members.

[0104] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that a specific feature, structure, material, or characteristic described based on the embodiment or example is included in at least one embodiment or example of the application. In this specification, exemplary descriptions of the above terms do not necessarily refer to the same embodiment or example. The described specific feature, structure, material, or characteristic may be combined in an appropriate manner in any one or more embodiments or examples. Furthermore, if not mutually inconsistent, a person skilled in the art may combine different embodiments or examples and features of different embodiments or examples described in this specification.

[0105] In describing the examples of the present application, the term "plurality" means two or more (including two); similarly, "groups" means two or more (including two groups); and "plurality" means two or more (including two). Unless expressly and specifically limited, "at least one" means one or more than one.

[0106] In this application, for convenience of explanation, the Z axis in the drawings indicates the up-down direction, with the positive direction of the Z axis indicating up and the negative direction of the Z axis indicating down; the Y axis in the drawings indicates the front-to-back direction, with the positive direction of the Y axis indicating rear and the negative direction of the Y axis indicating front; and the X axis in the drawings indicates the left-to-right direction, with the positive direction of the X axis indicating right and the negative direction of the X axis indicating left.

[0107] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells and provides higher voltage and capacity. A battery generally includes a housing for packaging one or more battery cells. The housing can prevent liquids and other foreign objects from affecting the charging and discharging of the battery cells.

[0108] In the embodiments of the present application, the battery cells may include, but are not limited to, lithium ion secondary batteries, lithium ion primary batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries, or magnesium ion batteries. The battery cells may also be cylindrical, flat, rectangular, or have other shapes, but are not limited to these in the embodiments of the present application. Battery cells are generally divided into three types depending on the packaging method: cylindrical battery cells, prismatic battery cells, and soft pouch battery cells, but are not limited to these in the embodiments of the present application.

[0109] The battery cell includes an electrode assembly consisting of a positive electrode sheet, a negative electrode sheet, and a separator, and an electrolyte. The battery cell operates primarily through the transfer of metal ions between the positive and negative electrode sheets.

[0110] The development of battery technology requires simultaneous consideration of various design factors, such as performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate, as well as reliability during battery use.

[0111] For battery cells, safety hazards mainly arise from the charging and discharging process, and at the same time, an appropriate environmental temperature must be designed. To effectively prevent unnecessary losses, battery cells usually have at least three protection measures. Specifically, the protection measures include at least a switch element, an appropriate separator material, and a first pressure release means.

[0112] The first pressure release means is an element or component that operates to release the internal pressure or temperature when the internal pressure, temperature, or other conditions of the battery cell reach a predetermined threshold. The design of the threshold varies depending on design needs. The threshold may be determined by one or more materials of the positive electrode sheet, negative electrode sheet, electrolyte, and separator in the battery cell. The first pressure release means may take the form of an explosion-proof valve, air valve, pressure release valve, safety valve, etc., and may specifically be a pressure- or temperature-sensitive element or structure. That is, when the internal pressure, temperature, or other conditions of the battery cell reach a predetermined threshold, the first pressure release means operates, or a weak structure provided in the first pressure release means breaks, creating a passage for releasing the internal pressure or temperature.

[0113] The term "operation" in the examples of this application means that the first pressure release means operates or is activated to a certain state, thereby releasing the internal pressure and temperature of the battery cell. Operation by the first pressure release means may include, but is not limited to, cases where at least a portion of the first pressure release means is broken, shattered, melted, torn, or opened. When the first pressure release means operates, the waste material inside the battery cell is discharged to the outside through the operating portion. In this way, by releasing the pressure and temperature of the battery cell when the pressure or temperature is controllable, the occurrence of a potentially more serious accident can be avoided.

[0114] When the first pressure release means operates, high-temperature and high-pressure materials inside the battery cell are discharged from the operating portion as discharge. In this way, by releasing the pressure and temperature of the battery cell when the pressure or temperature is controllable, it is possible to avoid the occurrence of a potentially more serious accident.

[0115] The discharged materials from the battery cells referred to in the examples of this application include, but are not limited to, electrolyte, dissolved or decomposed positive and negative electrode sheets, separator fragments, high-temperature and high-pressure gases resulting from reactions, flames, etc.

[0116] Typically, waste materials released from battery cells spread within the battery housing. When a second pressure release means is provided in the housing, activation of the second pressure release means expels the waste materials from the operating portion of the housing, mitigating further deterioration of the battery's thermal runaway. However, waste materials emitted from batteries typically contain high-temperature particulate matter caused by thermal runaway in battery cells. When high-temperature particulate matter is emitted from a battery, the temperature of the battery's exhaust gas becomes too high, easily causing deterioration of the battery's external environment and seriously affecting the battery's reliability. The operating principles of the first and second pressure release means are similar, and a detailed description thereof will be omitted here.

[0117] Based on this, in order to improve reliability of use, an embodiment of the present application provides a battery in which, when thermal runaway occurs in a battery cell within the battery, the first pressure release means is activated, and the waste generated in the battery cell passes through the first pressure release means and is released into a pressure release passage and moves along the pressure release passage to the second pressure release means. As the thermal runaway continues to intensify, the second pressure release means is activated, and the waste in the pressure release passage passes through the second pressure release means and is released to the outside of the housing. During this process, a filter element is provided in at least one of the battery cell, battery module, housing, and pressure release passage, and the filter holes on the filter element can prevent high-temperature particulate matter in the waste from passing through and reduce the high-temperature particulate matter ejected from the battery, thereby reducing the risk of the battery's exhaust temperature becoming too high and helping to improve the reliability of use of the battery.

[0118] In the battery and the power-using device using the battery as a power source disclosed in the embodiments of the present application, the power-using device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, an electric motorcycle, an electric car, a boat, a spacecraft, etc. Among them, the electric toys may include stationary or mobile electric toys such as game consoles, electric car toys, electric boat toys, and electric airplane toys, and the spacecraft may include airplanes, rockets, space shuttles, spaceships, etc.

[0119] In the following embodiment, for convenience of explanation, an example will be described in which the power-using device of one embodiment of the present application is a vehicle 1000.

[0120] Please refer to FIG. 1 , which is a structural schematic diagram of a vehicle 1000 provided according to some embodiments of the present application. The vehicle 1000 may be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a battery electric vehicle, a hybrid vehicle, or an extended-range electric vehicle, etc. Inside the vehicle 1000, a battery 1100 is provided, which may be provided at the bottom, head, or rear of the vehicle 1000. The battery 1100 may be used to power the vehicle 1000, for example, the battery 1100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 1200 and a motor 1300, and the controller 1200 is used to control the battery 1100 to supply power to the motor 1300, for example, for starting the vehicle 1000, navigation, and operational power needs during driving.

[0121] In some embodiments of the present application, the battery 1100 can not only function as the operating power source for the vehicle 1000, but can also provide the driving power for the vehicle 1000 as a power source for driving the vehicle 1000, as an alternative or partial alternative to gasoline or natural gas.

[0122] Referring to FIG. 2 , one embodiment of a battery 1100 includes a housing 10 and a battery module 20 housed within the housing 10. The housing 10 is used to provide a storage space for battery cells 21, and the housing 10 can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12 that fit together, and the first portion 11 and the second portion 12 jointly define a storage space for the battery cells 21. The second portion 12 can have a hollow structure with an open end, or the first portion 11 can have a plate-like structure, and the first portion 11 is fitted to the open side of the second portion 12, so that the first portion 11 and the second portion 12 jointly define the storage space. Both the first portion 11 and the second portion 12 can have a hollow structure with an open end, and the open side of the first portion 11 is fitted to the open side of the second portion 12. Of course, the housing 10 formed from the first portion 11 and the second portion 12 may have various shapes such as a cylindrical body or a rectangular parallelepiped.

[0123] In another embodiment, the housing 10 may further include a top cover 13, a frame 14, and a bottom plate 15, and the top cover 13 and the bottom plate 15 are attached to the upper and lower sides of the frame 14, respectively, to define a storage space for accommodating the battery cells.

[0124] The battery module 20 includes one or more battery cells 21, among which the multiple battery cells 21 may be connected in series, in parallel, or in series-parallel connection, where series-parallel connection means that some of the multiple battery cells 21 are connected in series and some are connected in parallel.

[0125] In one embodiment, the battery cells 21 may be directly connected in series, parallel, or series-parallel, and then the battery module 20 including the battery cells 21 may be housed in the housing 10. Alternatively, the battery modules 20 may be integrally formed by connecting the battery cells 21 in series, parallel, or series-parallel, and then housed in the housing 10. The battery 1100 may further include other structures. For example, the battery 1100 may further include bus members for electrically connecting the battery cells 21. Each battery cell 21 may be a secondary battery or a primary battery, and may be, but is not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cells 21 may be cylindrical, flat, rectangular, or have other shapes.

[0126] Please refer to Fig. 3, which is an exploded structural schematic diagram of a battery cell 21 provided according to some embodiments of the present application. The battery cell 21 refers to the smallest unit constituting a battery. As shown in Fig. 3, the battery cell 21 includes a housing, an electrode assembly 213, and other functional components. For example, the housing includes an end cap 212 and a case 211.

[0127] The end cap 212 is a component that fits over the opening of the case 211 to isolate the internal environment of the battery cell 21 from the external environment. The shape of the end cap 212 is not limited and can be adapted to the shape of the case 211 to fit the case 211. In one embodiment, the end cap 212 may be made of a material (e.g., aluminum alloy) with a certain hardness and strength. In this way, the end cap 212 is less likely to deform when subjected to pressure or impact, and the battery cell 21 has higher structural strength and improved safety. The end cap 212 may be provided with functional components such as electrode terminals 214. The electrode terminals 214 can be used to electrically connect to the electrode assembly 213 to output or input electrical energy to the battery cell 21. In some embodiments, the end cap 212 may be provided with a first pressure release means 215 for releasing internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. The end cap 212 may be made of various materials such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., but is not particularly limited in the embodiments of the present application. In some embodiments, an insulating member may be further provided inside the end cap 212. The insulating member can be used to separate the electrical connection members in the case 211 from the end cap 212 and reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, etc.

[0128] The case 211 is an assembly that, together with the end cap 212, forms an internal environment of the battery cell 21. The formed internal environment can be used to accommodate the electrode assembly 213, electrolyte, and other components. The case 211 and the end cap 212 may be separate components, or an opening may be formed in the case 211 and the end cap 212 may be fitted over the opening to form the internal environment of the battery cell 21. This is not a limitation, and the end cap 212 and the case 211 may be integrated. In one embodiment, the end cap 212 and the case 211 may form a common connection surface before other components are inserted into the case. When it is necessary to seal the interior of the case 211, the end cap 212 may be fitted over the case 211. The case 211 may have various shapes and dimensions, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism. In one embodiment, the shape of the case 211 may be determined depending on the specific shape and dimensions of the electrode assembly 213. The case 211 may be made of various materials such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., but is not particularly limited in the embodiment of the present application.

[0129] The electrode assembly 213 is a component where an electrochemical reaction occurs in the battery cell 21. One or more electrode assemblies 213 may be included in the case 211. The electrode assembly 213 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (e.g., lithium ions) travel back and forth between the positive electrode and the negative electrode, inserting and detaching them. The separator, which is provided between the positive electrode and the negative electrode, prevents short-circuiting between the positive and negative electrodes and allows the active ions to pass through.

[0130] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0131] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0132] In some embodiments, the separating member is a separator. The present application is not particularly limited to the type of separator, and any separator having a known porous structure and having good chemical stability and mechanical stability can be selected.

[0133] In some embodiments, the electrode assembly 213 has a wound structure, in which the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0134] In some embodiments, the electrode assembly 213 is a laminated structure.

[0135] As shown in FIGS. 4-8, a battery 1100 is provided in one embodiment of the present application. The battery 1100 includes a housing 10, a battery module 20 located within the housing 10, and a pressure release passage 30, the battery module 20 including at least one battery cell 21, each battery cell 21 being provided with a first pressure release means 215, the housing 10 having a second pressure release means 16, the pressure release passage 30 connecting the first pressure release means 215 of at least one battery cell 21 to the second pressure release means 16, the first pressure release means 215, when activated, being used to release exhaust generated inside the battery cell 21 to the pressure release passage 30, the pressure release passage 30 being used to direct the exhaust to the second pressure release means 16, the second pressure release means 16, when activated, being used to release the exhaust in the pressure release passage 30 to the outside of the housing 10, and at least one of the battery cell 21, the battery module 20, the housing 10, and the pressure release passage 30 being provided with a filter member 40 having filter holes 401 for preventing particulate matter in the exhaust from passing through.

[0136] When the first pressure release means 215 is activated, it can release waste generated by thermal runaway of the battery cell 21 to the outside of the battery cell 21. As shown in FIG. 3, when the battery cell 21 is in normal use, the first pressure release means 215 may be provided on the end cap 212 of the battery cell 21, which is the top of the battery cell 21, or on the side wall of the case 211 of the battery cell 21, or on the bottom of the battery cell 21.

[0137] When activated, the second pressure release means 16 can release waste matter released from the battery cell 21 into the pressure release passage 30 to the outside of the housing 10, and the second pressure release means 16 may be provided on the top cover 13, frame 14 or bottom plate 15 of the housing 10.

[0138] The pressure release passage 30 may refer to a passage or space through which the effluent moves in the process of moving the effluent released after the first pressure release means 215 is activated to the second pressure release means 16. For example, as shown in FIGS. 8 to 10 , the pressure release passage 30 is located within the housing 10, i.e., the pressure release passage 30 may be part of the storage space formed by being surrounded by the housing 10, and this part may be located together with the battery cells 21 in one space, or may be two separate spaces together with the space in which the battery cells 21 are located, where the pressure release passage 30 and the battery cells 21 are located in two separate spaces, respectively, thereby isolating the effluent from the battery cells 21 and improving the reliability of the battery 1100.

[0139] The pressure release passage 30 connects the first pressure release means 215 and the second pressure release means 16 of at least one battery cell 21. As can be understood, when the first pressure release means 215 and the second pressure release means 16 connected to the pressure release passage 30 are simultaneously operated, the pressure release passage 30 can communicate the corresponding first pressure release means 215 and second pressure release means 16, so that exhaust released from the first pressure release means 215 can move to the second pressure release means 16 and be discharged to the outside of the battery 1100 via the second pressure release means 16. Furthermore, when there is one battery cell 21, the pressure release passage 30 connects the first pressure release means 215 and the second pressure release means 16 of the battery cell 21. When there are multiple battery cells 21, the number of battery cells 21 connected to the pressure release passage 30 can include, but is not limited to, one, two, three, or four.

[0140] The filter member 40 may refer to a member having filter holes 401 formed therein, and the filter holes 401 may have a pore structure that can prevent particulate matter in the discharge from passing through.

[0141] At least one of the battery cells 21, the battery modules 20, the housing 10, and the pressure relief passage 30 is provided with a filtering member 40. As can be understood, the filtering member 40 may be provided in any one of the battery cells 21, the battery modules 20, the housing 10, and the pressure relief passage 30, or in any two of the battery cells 21, the battery modules 20, the housing 10, and the pressure relief passage 30, or in any three of the battery cells 21, the battery modules 20, the housing 10, and the pressure relief passage 30. The filtering member 40 is provided in all of the battery cells 21, the battery modules 20, the housing 10, and the pressure relief passage 30, and here, the filtering member 40 provided in the battery cells 21 can prevent particulate matter in the exhaust released from the battery cells 21 from entering the pressure release passage 30, the filter member 40 provided in the battery module 20 can prevent particulate matter in the exhaust released from the battery cells 21 in the battery module 20 from entering the pressure release passage 30 or moving to the second pressure release means 16, the filter member 40 provided in the pressure release passage 30 can prevent particulate matter in the exhaust released from the battery cells 21 from moving to the second pressure release means 16, and the filter member 40 provided in the housing 10 can prevent particulate matter in the pressure release passage 30 from being discharged outside the battery 1100, and all of these forms can reduce the high-temperature particulate matter discharged from the battery 1100.

[0142] In the battery 1100 of the embodiment of the present application, when thermal runaway occurs in a battery cell 21 within the battery 1100, the first pressure release means 215 is activated, and the waste generated in the battery cell 21 passes through the first pressure release means 215 and is released into the pressure release passage 30, and then moves along the pressure release passage 30 to the second pressure release means 16. As the thermal runaway continues to intensify, the second pressure release means 16 is activated, and the waste in the pressure release passage 30 passes through the second pressure release means 16 and is released to the outside of the housing 10. During this process, a filter member 40 is provided in at least one of the battery cell 21, the battery module 20, the housing 10, and the pressure release passage 30. The filter holes 401 on the filter member 40 can prevent high-temperature particulate matter in the waste from passing through, reducing the amount of high-temperature particulate matter ejected from the battery 1100. This reduces the risk of the exhaust temperature of the battery 1100 becoming too high, and helps to improve the usage reliability of the battery 1100.

[0143] In another embodiment of the present application, when the filtering member 40 is provided in the battery cell 21, the first pressure release means 215 and the filtering member 40 are an integrated structure.

[0144] The first pressure release means 215 and the filter member 40 are integrated to form an integrated structure, where the first pressure release means 215 and the filter member 40 can be connected by screwing, engaging, welding, gluing, etc. to form the integrated structure.

[0145] By adopting the technical solution of this embodiment, the first pressure release means 215 and the filtering member 40 form an integrated structure, and the integrated structure can be attached to the battery cell 21, which is easy and simple to assemble.

[0146] In another embodiment of the present application, when the filtering member 40 is provided in the battery cell 21 , the filtering member 40 is connected to the housing of the battery cell 21 .

[0147] The filtering member 40 is fixedly connected to the case 211 of the battery cell 21, where the filtering member 40 can be fixed to the case 211 by screwing, engaging, welding, adhesive, etc.

[0148] By adopting the technical solution of this embodiment, the filter element 40 is directly connected to the case 211, which simplifies the connection structure and simplifies the assembly operation.

[0149] In another embodiment of the present application, when the filtering member 40 is provided in the housing 10, the second pressure release means 16 and the filtering member 40 are an integrated structure.

[0150] The second pressure release means 16 and the filter member 40 are integrated to form an integrated structure, where the second pressure release means 16 and the filter member 40 can be connected by screwing, engaging, welding, gluing, etc. to form the integrated structure.

[0151] By adopting the technical solution of this embodiment, the second pressure release means 16 and the filter member 40 form an integrated structure, which can be attached to the housing 10, and the assembly is easy and simple.

[0152] In another embodiment of the present application, as shown in FIGS. 5 and 6, when the filtering member 40 is provided in the housing 10, the filtering member 40 is connected to the housing 10.

[0153] The filter element 40 is fixedly connected to the housing 10, where the filter element 40 can be secured to the housing 10 by screwing, engaging, welding, gluing, or the like.

[0154] By adopting the technical solution of this embodiment, the filtering element 40 is directly connected to the housing 10, which simplifies the connecting operation and facilitates manufacturing.

[0155] In another embodiment of the present application, when the filtering member 40 is provided in the housing 10, a filtering hole 401 is provided in the side wall of the housing 10, and the portion of the side wall of the housing 10 where the filtering hole 401 is provided forms the filtering member 40.

[0156] The filter hole 401 is provided directly on the side wall of the housing 10, so that the portion of the side wall of the housing 10 where the filter hole 401 is provided functions directly as the filter member 40, and here, the filter hole 401 is provided in at least one of the front / rear, left / right, top / bottom side walls of the housing 10.

[0157] By adopting the technical solution of this embodiment, the part of the side wall of the housing 10 where the filter hole 401 is opened directly functions as the filter member 40, so there is no need to add an additional filter member, which simplifies the structure of the housing 10 and helps reduce manufacturing costs.

[0158] In another embodiment of the present application, as shown in FIG. 8, when a filter member 40 is provided in the housing 10, the filter member 40 is provided on the side of the second pressure release means 16 facing the battery module 20 to prevent particulate matter released from the battery cells 21 from entering the second pressure release means 16.

[0159] The filter member 40 is provided on the side of the second pressure release means 16 facing the battery module 20, and as can be seen, the filter member 40 is not exposed from the housing 10 but is located inside the housing 10, making the use reliability of the filter member 40 higher.

[0160] By adopting the technical solution of this embodiment, the particulate matter in the discharged matter is filtered by the filter member 40 and then discharged outside the battery 1100 through the second pressure release means 16, thereby reducing the amount of high-temperature particulate matter discharged from the battery 1100 and improving the reliability of use of the battery 1100. In addition, the probability of contact between the particulate matter and the external environment of the housing 10 is reduced, which reduces the risk of causing the battery 1100 to have an excessively high exhaust temperature, thereby better improving the reliability of the battery 1100.

[0161] In another embodiment of the present application, when a filter member 40 is provided in the housing 10, a filter member 40 is provided on the side of the second pressure release means 16 facing away from the battery module 20 to prevent the passage of particulate matter released from the second pressure release means 16.

[0162] The filter member 40 is provided on the side of the second pressure release means 16 that faces away from the battery module 20, and as can be understood, the filter member 40 is located on the side of the second pressure release means 16 that is exposed from the outside of the housing 10, i.e., the filter member 40 is exposed from the housing 10.

[0163] By adopting the technical solution of this embodiment, the discharged matter passes through the second pressure release means 16, and is filtered out of the particulate matter by the filtering member 40 before being discharged to the outside of the battery 1100, thereby reducing the amount of particulate matter discharged from the battery 1100 and improving the reliability of use of the battery 1100.

[0164] In another embodiment of the present application, when a filter member 40 is provided in the housing 10, a filter member 40 is provided on the side of the second pressure release means 16 facing the battery module 20 to prevent particulate matter released from the battery cells 21 from entering the second pressure release means 16, and a filter member 40 is provided on the side of the second pressure release means 16 facing away from the battery module 20 to prevent particulate matter released from the second pressure release means 16 from passing through.

[0165] By adopting the technical solution of this embodiment, the discharged material is filtered by the two filter members 40, which has a high filtering effect on particulate matter, which helps to reduce the particulate matter discharged from the battery 1100 and improve the usage reliability of the battery 1100.

[0166] In another embodiment of the present application, the sum of the cross-sectional areas of all the filter holes 401 of the filter member 40 is the filtering area. When the filter member 40 is provided on the side of the second pressure release means 16 facing the battery module 20, the filter member 40 located on the side of the second pressure release means 16 facing the battery module 20 becomes the first filtering member, and the filtering area of ​​the first filtering member is larger than the maximum pressure release area of ​​the second pressure release means 16. When the filter member 40 is provided on the side of the second pressure release means 16 facing away from the battery module 20, the filter member 40 located on the side of the second pressure release means 16 facing away from the battery module 20 becomes the second filtering member, and the filtering area of ​​the second filtering member is smaller than the maximum pressure release area of ​​the second pressure release means 16.

[0167] The filtration area may refer to the sum of the cross-sectional areas of all the filter holes 401 on the filter member 40, i.e., the total area of ​​the filter member 40 through which waste matter can pass, where the cross-sectional area means the area of ​​the pattern obtained by cutting the filter hole 401 with a plane perpendicular to the axis of the filter hole 401.

[0168] The first filtering member may refer to the filtering member 40 located on the side of the second pressure release means 16 facing the battery cell 21, and the waste released from the battery cell 21 passes through the first filtering member and then passes through the second pressure release means 16 to be discharged; that is, the first filtering member and the second pressure release means 16 are arranged in sequence along the discharge path of the waste.

[0169] The maximum pressure release area of ​​the second pressure release means 16 may refer to the maximum flow area of ​​the discharged matter passing through the second pressure release means 16 when the second pressure release means 16 is fully open. For example, the second pressure release means 16 is an explosion-proof sheet, the housing 10 is normally provided with a pressure release hole 141, the explosion-proof sheet covers the pressure release hole 141, and after the explosion-proof sheet is completely damaged, if the area of ​​the damaged region of the explosion-proof sheet is smaller than the cross-sectional area of ​​the pressure release hole 141, the area of ​​the damaged region of the explosion-proof sheet becomes the maximum pressure release area of ​​the second pressure release means 16; or if the area of ​​the damaged region of the explosion-proof sheet is larger than the cross-sectional area of ​​the pressure release hole 141, the cross-sectional area of ​​the pressure release hole 141 becomes the maximum pressure release area of ​​the second pressure release means 16. After the explosion-proof sheet and the housing 10 are completely separated, the cross-sectional area of ​​the pressure release hole 141 becomes the maximum pressure release area of ​​the second pressure release means 16, and the second pressure release means 16 is an explosion-proof valve, and the maximum pressure release area in the technical description of the explosion-proof valve becomes the maximum pressure release area of ​​the second pressure release means 16. If the technical description of the explosion-proof valve does not specify a maximum pressure release area, the maximum pressure release area of ​​the second pressure release means 16 may refer to the maximum flow area of ​​the discharged material flowing through the explosion-proof valve when it is fully open.

[0170] The second filtering member may refer to the filtering member 40 located on the side of the second pressure release means 16 facing away from the battery cell 21, and the waste released from the battery cell 21 passes through the second pressure release means 16 and is filtered by the second filtering member before being discharged; that is, the second pressure release means 16 and the second filtering member are arranged in sequence along the discharge path of the waste.

[0171] The filtering area of ​​the first filtering member is larger than the maximum pressure release area of ​​the second pressure release means 16. As can be seen, as the discharged material flows sequentially through the first filtering member and the second pressure release means 16, the flow area of ​​the discharged material becomes smaller in succession, thereby achieving the effect of gradually releasing pressure, which improves the discharge efficiency of the discharged material and helps to improve the reliability of use of the battery 1100.

[0172] The filtering area of ​​the second filtering member is smaller than the maximum pressure release area of ​​the second pressure release means 16. As can be seen, as the discharged material flows sequentially through the second pressure release means 16 and the second filtering member, the flow area of ​​the discharged material becomes smaller in succession, thereby achieving the effect of gradually releasing pressure, which improves the discharge efficiency of the discharged material and helps to improve the reliability of use of the battery 1100.

[0173] By adopting the technical solution of this embodiment, the flow area of ​​the exhaust material is reduced along the exhaust path, and the effect of gradually releasing pressure can be achieved, which is helpful in improving the exhaust material discharge effect and improving the use reliability of battery 1100. In addition, the gradual reduction in the flow area also helps to reduce design redundancy and reduce manufacturing costs.

[0174] In another embodiment of the present application, when a first filtering member is provided on the side of the second pressure release means 16 facing the battery module 20, the number of first filtering members is multiple, the multiple first filtering members are arranged in order along the discharge path of the waste released from the battery cells 21, and the filtering areas of the multiple first filtering members become smaller along the discharge path of the waste. When a second filtering member is provided on the side of the second pressure release means 16 away from the pressure release passage 30, the number of second filtering members is multiple, the multiple second filtering members are arranged in order along the discharge path of the waste released from the second pressure release means 16, and the filtering areas of the multiple second filtering members become smaller along the discharge path of the waste.

[0175] A plurality of first filtering members are provided on the side of the second pressure release means 16 facing the battery module 20, and the plurality of first filtering members are arranged in sequence along the exhaust discharge path. Here, the exhaust path may refer to the flow path of the exhaust within the pressure release passage 30, so that the exhaust released from the battery cell 21 can pass through each first filtering member in sequence and then pass through the second pressure release means 16 to be discharged. In this way, the exhaust is discharged after undergoing multiple filtrations, which helps to reduce the number of particulate matter discharged from the battery 1100 and improve the usage reliability of the battery 1100. In addition, the filtering area of ​​the plurality of first filtering members decreases along the exhaust discharge path. As can be understood, the filtering area of ​​the first filtering members along the exhaust discharge path may gradually decrease or may decrease in steps, that is, there may be cases where the filtering area of ​​two adjacent first filtering members is the same. The discharged material flows into the second pressure release means 16 after passing through the first filtering member whose filtering area gradually decreases, so that the flow area of ​​the discharged material gradually decreases, enabling the discharged material to be released through multiple stages of pressure release, thereby improving the discharge efficiency of the discharged material and helping to improve the reliability of use of the battery 1100.

[0176] A plurality of second filter members are provided on the side of the second pressure release means 16 facing away from the battery module 20. The plurality of second filter members are arranged in sequence along the exhaust discharge path, so that exhaust released from the second pressure release means 16 passes through each first filter member in sequence before being discharged outside the battery 1100. In this manner, the exhaust is discharged after undergoing multiple filtration processes, reducing the number of particulate matter discharged from the battery 1100 and contributing to improving the reliability of the battery 1100. The filtering areas of the plurality of second filter members decrease along the exhaust discharge path. As can be seen, the filtering areas of the second filter members along the exhaust discharge path may decrease gradually or in stages, i.e., two adjacent second filter members may have the same filtering area. The exhaust passes through the second filter members with gradually decreasing filtering areas before being discharged outside the battery 1100. This gradually decreasing exhaust flow area allows for multi-stage pressure release of the exhaust, improving the exhaust discharge efficiency and contributing to improving the reliability of the battery 1100.

[0177] By adopting the technical solution of this embodiment, multiple filtration of the discharged material can be realized, which helps to reduce the number of particulate matter discharged. At the same time, multiple pressure release of the discharged material can be realized, which improves the discharge efficiency of the discharged material and helps to improve the usage reliability of the battery 1100.

[0178] In another embodiment of the present application, when a plurality of first filter members are provided on the side of the second pressure release means 16 facing the battery module 20, the hole diameters of the filter holes 401 of the plurality of first filter members become smaller along the discharge path of the exhaust, and when a plurality of second filter members are provided on the side of the second pressure release means 16 facing away from the pressure release passage 30, the hole diameters of the filter holes 401 of the plurality of second filter members become smaller along the discharge path of the exhaust.

[0179] The pore size of the filtration hole 401 may refer to the radial dimension of the filtration hole 401, and as an example, if the filtration hole 401 is a circular hole, the pore size refers to the diameter of the circular hole.

[0180] Generally, the larger the diameter of the filter holes 401, the larger the size of the particulate matter that can pass through the filter holes 401, and the smaller the diameter of the filter holes 401, the smaller the size of the particulate matter that can pass through the filter holes 401.

[0181] The pore size of the filter holes 401 of the plurality of first filter members becomes smaller along the discharge path of the discharge material, and it can be seen that the discharge material passes through a first filter member with a larger pore size, and then passes through a first filter member with a smaller pore size, thereby filtering out large particulate matter in the discharge material and then filtering out small particles in the discharge material, and in this way, the step-by-step filtration reduces the risk of clogging of the filter member 40, reduces the risk of pressure release not being performed smoothly, and helps to improve the reliability of use of the battery 1100.

[0182] The pore size of the filter holes 401 of the plurality of second filter members 40 becomes smaller along the discharge path of the discharge material. As can be seen, the discharge material passes through the second filter members 40 with larger pore sizes, and then passes through the second filter members 40 with smaller pore sizes, thereby filtering out large particulate matter in the discharge material and then filtering out small particles in the discharge material. In this way, the step-by-step filtration reduces the probability of clogging of the filter members 40, reduces the risk of pressure release not being performed smoothly, and helps to improve the reliability of use of the battery 1100.

[0183] In another embodiment of the present application, as shown in FIG. 10, the filter element 40 and the second pressure relief means 16 are spaced apart.

[0184] The filter member 40 and the second pressure release means 16 are spaced apart, and as can be understood, there is a certain space between the second pressure release means 16 and the filter member 40, which can be used to provide an operating space for the operation of the second pressure release means 16, reducing the risk of interference. The size of the space can be set according to the operating space of the second pressure release means 16, but is not limited here.

[0185] By adopting the technical solution of this embodiment, the risk of interference between the second pressure release means 16 and the filter member 40 can be reduced.

[0186] In another embodiment of the present application, as shown in Figures 5 and 6, the filtering member 40 includes a plate portion 41 and a ring wall portion 42 arranged around the plate portion 41, one end of the ring wall portion 42 is connected to the plate portion 41 and the other end of the ring wall portion 42 is connected to the housing 10, the ring wall portion 42 is arranged around the second pressure release means 16, and at least one of the ring wall portion 42 and the plate portion 41 has a filtering hole 401.

[0187] 5 and 6, the filtering element 40 is rectangular, the plate portion 41 may refer to the bottom portion of the filtering element 40, and the annular wall portion 42 may refer to the side wall portion 72 of the filtering element 40. Here, the annular wall portion 42 may have various shapes such as a circle, a square, or an ellipse. The annular wall portion 42 is provided around the second pressure release means 16, so that the filtering element 40 covers the second pressure release means 16, thereby filtering particulate matter in the discharge.

[0188] At least one of the ring wall portion 42 and the plate portion 41 is provided with a filter hole 401, and as can be understood, the ring wall portion 42 may be provided with a filter hole 401, or the plate portion 41 may be provided with a filter hole 401, or both the ring wall portion 42 and the plate portion 41 may be provided with a filter hole 401, and in this way the filter hole 401 prevents particulate matter in the discharge from passing through, thereby achieving filtration.

[0189] By adopting the technical solution of this embodiment, the structure of the filter element 40 is simple, and the processing and manufacturing are easy.

[0190] In another embodiment of the present application, as shown in Figures 23 to 25, the filter member 40 has a first filtering section 43 and a second filtering section 44, and both the first filtering section 43 and the second filtering section 44 are provided with a plurality of filtering holes 401. A first discharge path N' passing through the filtering holes 401 of the first filtering section 43 and a second discharge path N passing through the filtering holes 401 of the second filtering section 44 are formed between the first pressure release means 215 and the second pressure release means 16 of at least one battery cell 21. When the length of the first discharge path N' is greater than the length of the second discharge path N, the hole diameter of the filtering holes 401 of the first filtering section 43 is greater than the hole diameter of the filtering holes 401 of the second filtering section 44.

[0191] The filter member 40 has a plurality of filter holes 401 formed therein, and the filter holes 401 have different diameters. The area where the filter holes 401 with larger diameters are located may be referred to as the first filtering section 43, and the area where the filter holes 401 with smaller diameters are located may be referred to as the second filtering section 44. When the battery cell 21 experiences thermal runaway, the exhaust released from the battery cell 21 flows into the pressure release passage 30 and moves along the pressure release passage 30 to the outside of the battery 1100. In this process, the exhaust has a plurality of discharge paths through which the exhaust flows to the second pressure release means 16. Among these, the discharge path through the filter holes 401 of the first filtering section 43 is referred to as the first discharge path N', and the discharge path through the second filtering section 44 is referred to as the second discharge path N. The length of the first discharge path N' is longer than the length of the second discharge path N. As such, the flow time of the exhaust material flowing through the first exhaust path N' is long, the cooling time of the small particles in the exhaust material is long, the cooling effect is high, the discharge temperature of the granular material to the housing is low, and even if the large particles are discharged outside the battery 1100, they are unlikely to cause environmental deterioration. Similarly, the flow time of the exhaust material flowing through the second exhaust path N is short, the cooling time of the small particles in the exhaust material is short, and the discharge temperature of the granular material to the housing is high, and even if the large particles are discharged outside the battery 1100, they may easily cause environmental deterioration. Furthermore, as for large particles in the exhaust material, their temperature may not decrease significantly compared to small particles after cooling through the long exhaust path, and when the large particles are discharged outside the battery 1100, they may still cause the problem of the exhaust temperature of the battery 1100 becoming too high.

[0192] By adopting the technical solution of this embodiment, the pore diameter of the filter holes 401 of the first filtering section 43 is larger than the pore diameter of the filter holes 401 of the second filtering section 44. Thus, the low-temperature small particulate matter in the discharged material flowing through the long exhaust path passes directly through the filter holes 401 of the first filtering section 43 and is discharged to the outside of the battery 1100. At the same time, the filter holes 401 of the first filtering section 43 also block the large particles with high temperatures in the discharged material. Furthermore, the large particles with high temperatures in the discharged material flowing through the short exhaust path are not discharged to the outside of the battery 1100 but are all blocked by the filter holes 401 of the second filtering section 44. This reduces the risk of causing the exhaust temperature of the battery 1100 to be too high and improves the reliability of use of the battery 1100. Furthermore, the combined design of filter holes 401 of different sizes allows the discharged material to be quickly discharged to the outside of the battery 1100, reducing the risk of pressure building up inside the housing 10.

[0193] In another embodiment of the present application, as shown in FIGS. 5 and 6, the number of the filter holes 401 is plural, and any two filter holes 401 have the same diameter.

[0194] Any two filter holes 401 have the same pore size, and as can be appreciated, all filter holes 401 have the same pore size.

[0195] By adopting the technical solution of this embodiment, all the filter holes 401 have the same diameter, the structure of the filter member 40 is simple, and the processing and manufacturing can be easily performed.

[0196] In another embodiment of the present application, as shown in FIG. 24, the number of filter holes 401 is plural, and at least two of the filter holes 401 have different diameters.

[0197] At least two of the filter holes 401 have different pore sizes, and as can be appreciated, some filter holes 401 have larger pore sizes, some have smaller pore sizes, and are not all the same.

[0198] By adopting the technical solution of this embodiment, the size of the pore size of the filter holes 401 can be flexibly designed to meet the requirements for the discharge of waste, and the use reliability of the battery 1100 is made higher.

[0199] In another embodiment of the present application, as shown in Figures 7 to 13, the pressure release passage 30 further includes a first sub-pressure release passage 31 for connecting to the second pressure release means 16, and the battery 1100 further includes a partition 50 for separating the battery module 20 from the first sub-pressure release passage 31, and the partition 50 is provided with a plurality of first breathable structures 51, and each first breathable structure 51 connects the first pressure release means 215 of at least one battery cell 21 to the first sub-pressure release passage 31.

[0200] The first sub-pressure release passage 31 may also refer to a passage that can be connected to the second pressure release means 16, and the exhaust released from the battery cell 21 can enter the first sub-pressure release passage 31 and then move along the first sub-pressure release means to the second pressure release means 16.

[0201] The partition 50 may refer to a member capable of separating the battery module 20 from the first sub-pressure relief passage 31. In some embodiments, the partition 50 may be a partition plate or other structure capable of separating the battery module 20 from the first sub-pressure relief passage 31.

[0202] The first ventilation structure 51 may refer to a ventilation structure that can connect the first sub-pressure relief passage 31 and the first pressure relief means 215, and waste released from the first pressure relief means 215 can pass through the first ventilation structure 51 and enter the first sub-pressure relief passage 31. The first ventilation structure 51 may be a through-hole, a ventilation valve, etc. However, without being limited thereto, in some embodiments, the first ventilation structure 51 may be a weak area provided in the partition 50, and when the first pressure relief means 215 is activated, the weak area is broken to connect the first pressure relief means 215 to the first sub-pressure relief passage 31.

[0203] Each first breathable structure 51 connects the first pressure release means 215 of at least one battery cell 21 to the first sub-pressure release passage 31, and as can be understood, when there is one battery cell 21, the first breathable structure 51 connects the first pressure release means 215 of the battery cell 21 to the first sub-pressure release passage 31, and when there are multiple battery cells 21, the number of battery cells 21 connected to the first breathable structure 51 includes, but is not limited to, one, two, three or four.

[0204] By adopting the technical solution of this embodiment, when a battery cell 21 in a battery module 20 experiences thermal runaway, the waste released from the first pressure release means 215 of the battery cell 21 passes through the first breathable structure 51 and enters the first pressure release passage 30. However, since the first pressure release passage 30 and the battery module 20 are separated by the partition 50, the risk of contact between the waste in the first pressure release passage 30 and other battery cells 21 in the battery module 20 is reduced, and the risk of thermal runaway spreading is reduced, which helps to improve the reliability of use of the battery 1100.

[0205] In another embodiment of the present application, as shown in FIG. 13 , the pressure release passage 30 includes at least two first sub-pressure release passages 31, each connecting a first breathable structure 51 corresponding to a different battery cell 21, and the first sub-pressure release passages 31 are separated by a spacing element 60.

[0206] The number of first sub-pressure release passages 31 includes, but is not limited to, two, three, four, or five, and each first sub-pressure release passage 31 connects the first pressure release means 215 of a different battery cell 21, so that the different battery cells 21 can be connected to the second pressure release means 16 through different first sub-pressure release passages 31, and the spacing element 60 may refer to a member located between and separating two adjacent first sub-pressure release passages 31, so that the two adjacent first sub-pressure release passages 31 become two independent passages.

[0207] By adopting the technical solution of this embodiment, if thermal runaway occurs in one of the battery cells 21, the waste released from that battery cell 21 will enter the first sub-pressure release passage 31 connected to that battery cell 21, and since the first sub-pressure release passages 31 are separated by the spacing element 60, the waste cannot directly enter other first sub-pressure release passages 31, which helps to reduce the risk of thermal runaway spreading.

[0208] In another embodiment of the present application, as shown in Figures 8 to 11, the pressure release passage 30 further includes a communicating passage 32, which is formed by being surrounded by the wall surface of the partition 50 and the inner wall surface of the housing 10, and each first sub-pressure release passage 31 is connected to the second pressure release means 16 via the communicating passage 32.

[0209] The communicating passage 32 may refer to the gap space located between the wall surface of the partition 50 and the inner wall surface of the housing 10, and the gap space can connect each first sub-pressure release passage 31 to the second pressure release means 16. In this way, the discharged matter flowing out from each first sub-pressure release passage 31 can pass through the communicating passage 32 and move to the second pressure release means 16, thereby realizing pressure release and discharge of the battery 1100.

[0210] By adopting the technical solution of this embodiment, the connecting passage is formed by the wall surface of the partition 50 and the inner wall surface of the housing 10, which has a simple structure and is easy to process and manufacture.

[0211] In another embodiment of the present application, as shown in FIGS. 4, 8 and 13, a battery module 20 includes at least one row of battery cells 21, each row of battery cells 21 includes at least one battery cell 21, and each row of battery cells 21 is provided with at least one first sub-pressure release passage 31 corresponding thereto, each first sub-pressure release passage 31 extending along the arrangement direction of the battery cells 21 in the corresponding row, and each first air-permeable structure 51 corresponding to the battery cells 21 in each row is connected to the corresponding first sub-pressure release passage 31.

[0212] The battery cells 21 in the battery module 20 are arranged in a matrix, and the battery module 20 includes at least one row of battery cells 21. That is, the number of rows of the battery cells 21 in the battery module 20 includes, but is not limited to, one, two, three, four, or five. The number of first sub-pressure release passages 31 provided corresponding to the battery cells 21 in each row may be one, two, three, four, or five. The first pressure release means 215 of the battery cells 21 in each row can all communicate with the corresponding first sub-pressure release passages 31. In this way, the waste released by the battery cells 21 due to thermal runaway can pass through the first breathable structure 51. The exhaust gas flows into the corresponding first sub-pressure release passage 31, flows into the second pressure release means 16, and finally passes through the second pressure release means 16 to be discharged outside the housing 10. For example, the number of rows of battery cells 21 is the same as the number of first sub-pressure release passages 31, and the first pressure release means 215 of each row corresponds to one first sub-pressure release passage 31. The first sub-pressure release passage 31 extends along the arrangement direction of the battery cells 21 in the corresponding row and is connected to the first pressure release means 215 of each battery cell 21 in the corresponding row, so that the exhaust gas released when the battery cells 21 experience thermal runaway enters the corresponding first sub-pressure release passage 31 and is discharged.

[0213] By adopting the technical solution of this embodiment, when thermal runaway occurs in a battery cell 21, the waste released from the battery cell 21 enters the corresponding first sub-pressure release passage 31 and is discharged, and the waste will not enter other first sub-pressure release passages 31 and come into contact with other battery cells 21, thereby reducing the risk of thermal runaway spreading and improving the reliability of the battery cells 21.

[0214] In another embodiment of the present application, as shown in FIG. 8, the second pressure release means 16 is located on the side of the end of the battery module 20 along the extension direction (X direction) of the first sub-pressure release passage 31.

[0215] The second pressure release means 16 is attached to the housing 10 and is located to the side of the end of the battery module 20 along the extension direction (X direction) of the first sub-pressure release passage 31, i.e., the second pressure release means 16 is located to the side of the end outlet of the first sub-pressure release passage 31.In this way, the discharged matter in the first sub-pressure release passage 31 can be discharged from the end opening of the first sub-pressure release passage 31 and then directly discharged outside the battery 1100 through the second pressure release means 16.

[0216] By adopting the technical solution of this embodiment, when the battery cell 21 experiences thermal runaway, the exhaust in the first sub-pressure release passage 31 can be quickly discharged to the second pressure release means 16, thereby improving the pressure release and exhaust effect of the battery 1100.

[0217] In another embodiment of the present application, as shown in FIG. 13, the communication passage 32 is an annular passage 33 provided around the partition 50 .

[0218] The communication passage 32 is annular and is provided around the partition 50 .

[0219] By adopting the technical solution of this embodiment, the exhaust discharged from the first sub-pressure release passage 31 enters the annular passage 33 and flows through the annular passage 33, thereby extending the exhaust path of the exhaust and lengthening the cooling time of the particulate matter in the exhaust, thereby reducing the risk of the particulate matter being discharged outside the battery 1100 and causing the exhaust temperature of the battery 1100 to be too high.

[0220] In another embodiment of the present application, as shown in Figures 14 to 16, end plates 22 are provided at both ends of at least one row of battery cells 21, and the end plates 22 are inserted into the annular passage 33 and connected to the inner wall surface of the housing 10, and the pressure release passage 30 further includes a second sub-pressure release passage 34 that intersects with the first sub-pressure release passage 31, and the second sub-pressure release passage 34 is used to connect the corresponding first sub-pressure release passage 31 and the annular passage 33.

[0221] The end plate 22 may refer to a member that fixes the battery cells 21 in the corresponding row and is located at the end of the battery cells 21 in the corresponding row, and the end plate 22 and the battery cells 21 can be connected by screwing, fastening, adhesive, or the like.

[0222] The end plate 22 is inserted into the annular passage 33 and is sealed to the inner wall surface of the housing 10. As can be seen, a sealed structure can be formed between the end plate 22 and the inner wall surface of the housing 10. The end plate 22 and the wall surface of the housing 10 can be sealed by welding, sealant, seal ring, or other sealing methods. This sealed structure separates the first sub-pressure relief passage 31 from the second pressure relief means 16, so that the exhaust in the first sub-pressure relief passage 31 can directly move to the second pressure relief means 16. However, the pressure release passage 30 further includes a second sub-pressure release passage 34, which may be a passage that intersects with the first sub-pressure release passage 31. In this way, the second sub-pressure release passage 34 extends laterally from the first sub-pressure release passage 31 and connects the first sub-pressure release means to the annular passage 33, so that the discharged matter in the first sub-pressure release passage 31 passes through the second sub-pressure release passage 34 and flows into the annular passage 33, and finally flows to the second pressure release means 16 and is discharged outside the housing 10.

[0223] By adopting the technical solution of this embodiment, the exhaust released from the battery cell 21 passes through the first sub-pressure release passage 31, the second sub-pressure release passage 34 and the annular passage 33 before flowing to the second pressure release means 16, and finally being discharged outside the battery 1100, thereby extending the exhaust discharge path, lengthening the cooling time of the particulate matter in the exhaust, and helping to reduce the risk of the exhaust temperature of the battery 1100 becoming too high.

[0224] In another embodiment of the present application, as shown in FIGS. 14 to 16, end plates 22 are provided on both ends of each row of battery cells 21, and each first sub-pressure release passage 31 communicates with a second sub-pressure release passage 34.

[0225] The end plates 22 at both ends of each row of battery cells 21 are inserted into the annular passage 33 and hermetically connected to the inner wall surface of the housing 10, thereby connecting the end plates 22 to the inner wall surface of the housing 10 and forming a hermetically sealed structure. In this way, exhaust gases discharged from each first sub-pressure release passage 31 can be discharged to the annular passage 33 through the second sub-pressure release passage 34. In addition, in the battery module 20, at least some of the end plates 22 located at the same end may be an integral structure connected by bolting, adhesive bonding, fastening, caulking, welding, integral molding, etc., but are not limited thereto. In this way, the battery cells 21 in the battery module 20 are more tightly connected. Here, integral molding refers to fabrication and molding using an integral process such as pressing, injection molding, or pressure casting.

[0226] By adopting the technical solution of this embodiment, when thermal runaway occurs in any one of the battery cells 21, the released waste materials pass through the corresponding first sub-pressure release passage 31 and second sub-pressure release passage 34 and flow into the annular passage 33, pass through the annular passage 33 to the second pressure release means 16, and then pass through the second pressure release means 16 to be released to the outside of the battery 1100, which helps to improve the usage reliability of the battery 1100.

[0227] In another embodiment of the present application, as shown in FIGS. 14 to 16, the pressure relief passage 30 includes a plurality of second sub-pressure relief passages 34, and the second sub-pressure relief passages 34 are separated by spacing elements 60.

[0228] There are multiple second sub-pressure release passages 34, and as can be understood, the number of second sub-pressure release passages 34 includes, but is not limited to, two, three, or four. Two adjacent second sub-pressure release passages 34 are separated by a spacing element 60, and as can be understood, two adjacent second sub-pressure release passages 34 do not directly communicate with each other, and the spacing element 60 simultaneously separates two adjacent first sub-pressure release passages 31 and two adjacent second sub-pressure release passages 34, making the structure of the entire battery 1100 highly compact.

[0229] By adopting the technical solution of this embodiment, through the design of multiple second sub-pressure relief passages 34, the exhaust in the first sub-pressure relief means can be discharged through the multiple second sub-pressure relief passages 34, which allows the exhaust to be discharged quickly, reduces the risks of pressure accumulation inside the housing 10, excessively high temperatures, etc., and helps improve the usage reliability of the battery 1100.

[0230] In another embodiment of the present application, as shown in FIGS. 14 to 16, a plurality of second sub-pressure release passages 34 are arranged at intervals in the direction in which the first sub-pressure release passage 31 extends (X direction).

[0231] As can be understood, the extension direction of the first sub-pressure release passage 31 may be the arrangement direction (X direction) of the battery cells 21 in one row of the battery cells 21.

[0232] By adopting the technical solution of this embodiment, the battery cells 21 arranged in the extension direction (X direction) of the first sub-pressure release passage 31 can quickly discharge the waste material released from the battery cells 21 into the annular passage 33 through the corresponding second sub-pressure release passage 34, and finally pass through the second pressure release means 16 and discharge it to the outside of the housing 10, thereby reducing the risks of pressure accumulation and excessively high temperatures inside the housing 10 and helping to improve the usage reliability of the battery 1100.

[0233] In another embodiment of the present application, as shown in FIGS. 14 to 16, the first sub-pressure release passage 31 and the second sub-pressure release passage 34 are perpendicular to each other.

[0234] The first sub-pressure release passage 31 and the second sub-pressure release passage 34 are vertical, and as can be understood, the first sub-pressure release passage 31 and the second sub-pressure release passage 34 are arranged vertically and horizontally. As an example, the spacing elements 60 are arranged in a matrix, with the first sub-pressure release passage 31 formed between two adjacent rows of spacing elements 60, and the second sub-pressure release passage 34 formed between two adjacent rows of spacing elements 60.

[0235] By adopting the technical solution of this embodiment, the first sub-pressure relief passage 31 and the second sub-pressure relief passage 34 are regularly distributed, which facilitates the processing and manufacturing.

[0236] In another embodiment of the present application, as shown in Figures 17 to 21, the annular passage 33 is provided with an annular member 70 connected to the housing 10, and the annular member 70 divides the annular passage 33 into a first sub-annular passage 331 and a second sub-annular passage 332 arranged around the first sub-annular passage 331. The annular member 70 is provided with a second breathable structure 71 for connecting the first sub-annular passage 331 and the second sub-annular passage 332, and the second sub-annular passage 332 is connected to the second pressure release means 16, and the first sub-annular passage 331 is connected to the first sub-pressure release passage 31.

[0237] The annular member 70 may refer to an annular member located within the annular passage 33 and extending in the circumferential direction of the annular passage 33. The annular member 70 is connected to the housing 10, which serves as a mounting base for the annular member 70. At the same time, the annular member 70 can divide the annular passage 33 into a first sub-annular passage 331 and a second sub-annular passage 332, of which the first sub-annular passage 331 is located inside the second sub-annular passage 332, i.e., the second sub-annular passage 332 is arranged around the first sub-annular passage 331. The shape of the annular member 70 is adapted to the shape of the annular passage 33, and the annular member 70 may have various shapes, such as a circle, a triangle, an ellipse, a rectangle, etc.

[0238] The second ventilation structure 71 may refer to a structure that can connect the first sub-annular passage 331 and the second sub-annular passage, and the second ventilation structure 71 may be a structure such as a through-hole, a ventilation valve, or a pressure relief valve.

[0239] The second sub-annular passage 332 is connected to the second pressure release means 16, and the first sub-annular passage 331 is connected to the first sub-pressure release passage 31. As can be understood, when the second pressure release means 16 is activated, the exhaust released from the battery cell 21 enters the first sub-annular passage 331, then passes through the second breathable structure 71 into the second sub-annular passage 332, and finally passes through the second pressure release means 16 to be released to the outside of the housing 10.

[0240] By adopting the technical solution of this embodiment, the exhaust released from the battery cell 21 needs to pass through the first sub-annular passage 331 and the second sub-annular passage 332, which can extend the exhaust path of the exhaust, prolong the cooling time of the particulate matter in the exhaust, reduce the risk of the exhaust temperature of the battery 1100 becoming too high, and help improve the usage reliability of the battery 1100.

[0241] In another embodiment of the present application, as shown in FIGS. 20 and 21, the second breathable structures 71 are through holes.

[0242] The through-hole may refer to a hole structure that passes through the annular member 70 .

[0243] According to the technical solution of this embodiment, the second breathable structure 71 is a through hole, which has a simple structure and is easy to process and manufacture.

[0244] In another embodiment of the present application, as shown in Figures 23 and 24, the annular member 70 includes at least three side wall portions 72 connected in series, and the side wall portion 72 closest to the second pressure release means 16 is provided with a second breathable structure 71.

[0245] The annular member 70 may be divided into multiple segments along its circumferential direction, and the side wall portion 72 may refer to one segment of the annular member 70; for example, as shown in FIG. 18, the annular member 70 is rectangular, and the side wall portion 72 refers to one side of the annular member 70.

[0246] The side wall portion 72 closest to the second pressure release means 16 may refer to the side wall portion 72 that is closest to the second pressure release means 16.

[0247] By adopting the technical solution of this embodiment, the second breathable structure 71 is close to the second pressure release means 16, and the discharged matter that passes through the second breathable structure 71 can quickly move to the second pressure release means 16 and be discharged through the second pressure release means 16, which is advantageous in preventing the risk of pressure accumulation inside the housing 10 and helps to improve the reliability of use of the battery 1100.

[0248] In another embodiment of the present application, as shown in Figures 23 and 24, when a filtering member 40 is provided in the housing 10, the side wall portion 72 close to the second pressure release means 16 becomes the filtering member 40, and the filtering hole 401 becomes the second breathable structure 71.

[0249] By adopting the technical solution of this embodiment, a filter hole 401 can be directly opened in the side wall portion 72 close to the second pressure release means 16, thereby realizing the filtration of the exhaust and realizing the communication between the first sub-annular passage 331 and the second sub-annular passage 332. The annular member 70 and the filter member 40 are integrated, which simplifies the structure and facilitates processing and manufacturing.

[0250] In another embodiment of the present application, as shown in Figures 18 to 21, the annular member 70 includes at least three side wall portions 72 connected in series, and the side wall portion 72 away from the second pressure release means 16 is provided with a second breathable structure 71.

[0251] The side wall portion 72 remote from the second pressure release means 16 may refer to a side wall portion 72 other than the side wall portion 72 closest to the second pressure release means 16 .

[0252] By adopting the technical solution of this embodiment, since the distance between the second breathable structure 71 and the second pressure release means 16 is long, the exhaust that has passed through the second breathable structure 71 can travel a certain distance to the second pressure release means 16 and be discharged from the housing 10. In this way, the discharge path of the exhaust can be extended, the cooling time of the particulate matter in the exhaust can be increased, the risk of the exhaust temperature of the battery 1100 becoming too high can be reduced, and the use reliability of the battery 1100 can be improved.

[0253] In another embodiment of the present application, as shown in Figures 18 to 21, the side wall portion 72 closer to the second pressure release means 16 is a first side wall portion 73, and at least one of the side wall portion 72 adjacent to the first side wall portion 73 and the side wall portion 72 facing the first side wall portion 73 is provided with a second breathable structure 71.

[0254] The first side wall portion 73 may refer to the side wall portion 72 closest to the second pressure release means 16 .

[0255] The side wall 72 adjacent to or opposite the first side wall 73 may be referred to as the side wall 72 remote from the second pressure release means 16 .

[0256] At least one of the side wall portion 72 adjacent to the first side wall portion 73 and the side wall portion 72 facing the first side wall portion 73 is provided with a second breathable structure 71, and as can be understood, the side wall portion 72 adjacent to the first side wall portion 73 is provided with the second breathable structure 71, or the side wall portion 72 facing the first side wall portion 73 is provided with the second breathable structure 71, or both the side wall portion 72 adjacent to the first side wall portion 73 and the side wall portion 72 facing the first side wall portion 73 are provided with the second breathable structure 71.

[0257] By adopting the technical solution of this embodiment, the second breathable structure 71 is designed to be separated from the second pressure release means 16, which can extend the discharge path of the discharged material, prolong the cooling time of the particulate matter in the discharged material, and help reduce the risk of the exhaust temperature of the battery 1100 becoming too high.

[0258] In another embodiment of the present application, the second breathable structure 71 is located at the center of the corresponding side wall portion 72, as shown in FIGS.

[0259] The second breathable structure 71 is located in the center of the corresponding side wall portion 72 , and as can be seen, the second breathable structure 71 is located at the intermediate position of the corresponding side wall portion 72 .

[0260] By adopting the technical solution of this embodiment, the second ventilation structure 71 is located in the center of the side wall portion 72, so that the distance from the battery cells 21 located at both ends to the second ventilation structure 71 is not too far. In this way, waste released from the battery cells 21 located at the ends can also be quickly discharged, which helps to improve the usage reliability of the battery 1100.

[0261] In another embodiment of the present application, when the filtering member 40 is provided in the housing 10, the side wall portion 72 away from the second pressure release means 16 becomes the filtering member 40, and the filtering holes 401 become the second breathable structure 71.

[0262] By adopting the technical solution of this embodiment, the filter hole 401 can be directly opened in the side wall portion 72 away from the second pressure release means 16, thereby realizing the filtration of the exhaust and realizing the communication between the first sub-annular passage 331 and the second sub-annular passage 332. The annular member 70 and the filter member 40 are integrated, which simplifies the structure and makes it easy to process and manufacture.

[0263] In another embodiment of the present application, as shown in FIGS. 18 to 21, when the filtering member 40 is provided in the housing 10, the filtering member 40 is covered with a second breathable structure 71.

[0264] The filter member 40 is disposed within the second ventilation structure 71. As can be seen, the filter member 40 can cover the second ventilation structure 71, with the filter member 40 located on the side of the second ventilation structure 71 facing the first sub-annular passage 331, such that discharge from the first sub-annular passage 331 is filtered by the filter member 40 before passing through the second ventilation structure 71 and entering the second sub-annular passage 332; or the filter member 40 can be located on the side of the second ventilation structure 71 facing away from the first sub-annular passage 331, such that discharge from the first sub-annular passage 331 passes through the second ventilation structure 71 and is filtered by the filter member 40 before entering the second sub-annular passage 332. Alternatively, the filter member 40 can be disposed on both the side of the second ventilation structure 71 facing the first sub-annular passage 331 and the side of the second ventilation structure 71 facing away from the first sub-annular passage 331, thereby achieving double filtration, improving the filtering effect and increasing the reliability of the battery 1100.

[0265] By adopting the technical solution of this embodiment, the filter member 40 is covered by the second breathable structure 71, which has a simple structure and is easy to process and manufacture.

[0266] In another embodiment of the present application, as shown in Figures 23 to 25, the filter member 40 is located between the battery module 20 and the second pressure release means 16 and has a first filtering section 43 and a second filtering section 44, each of which has a plurality of filter holes 401. Between the first pressure release means 215 of the battery cell 21 closest to the second pressure release means 16 and the second pressure release means 16, a first discharge path N' passing through the filter holes 401 of the first filtering section 43 and a second discharge path N passing through the filter holes 401 of the second filtering section 44 are formed. When the length of the first discharge path N' is longer than the length of the second discharge path N, the hole diameter of the filter holes 401 of the first filtering section 43 is larger than the hole diameter of the filter holes 401 of the second filtering section 44.

[0267] The battery cell 21 closest to the second pressure release means 16 may refer to the battery cell 21 that is closest to the second pressure release means 16 and located at the end of the battery module 20.

[0268] As shown in FIG. 25, the filter member 40 is located between the battery module 20 and the second pressure release means 16. As can be seen, the battery modules 20 are arranged in an array, and the filter member 40 and the second pressure release means 16 are located on the sides of the ends of the battery modules 20 distributed in the column direction (X direction) of the battery cells 21. The filter member 40 is located between the second pressure release means 16 and the battery module 20. In this way, the discharged matter discharged from any one battery cell 21 in the battery module 20 passes through the filter hole 401 of the first filtering section 43 through the first discharge path. The lengths of the paths N' are all greater than the length of the second discharge path N through which the waste discharged from the battery cells 21 passes through the filter holes 401 of the second filtering section 44. In this case, the positions of the first filtering section 43 and the second filtering section 44 can be determined during design according to the battery cell 21 that is closest to the second pressure release means 16, thereby ensuring that the length of the first discharge path N' through which the waste discharged from all battery cells 21 passes through the filter holes 401 of the first filtering section 43 is greater than the length of the second discharge path N through which the waste discharged from all battery cells 21 passes through the filter holes 401 of the second filtering section 44.

[0269] By adopting the technical solution of this embodiment, the pore diameter of the filter holes 401 of the first filtering section 43 is larger than the pore diameter of the filter holes 401 of the second filtering section 44. Thus, the low-temperature small particulate matter in the discharged material flowing through the long exhaust path passes directly through the filter holes 401 of the first filtering section 43 and is discharged to the outside of the battery 1100. At the same time, the filter holes 401 of the first filtering section 43 also block the large particles with high temperatures in the discharged material. Furthermore, the large particles with high temperatures in the discharged material flowing through the short exhaust path are not discharged to the outside of the battery 1100 but are all blocked by the filter holes 401 of the second filtering section 44. This reduces the risk of causing the exhaust temperature of the battery 1100 to be too high and improves the reliability of use of the battery 1100. Furthermore, the combined design of filter holes 401 of different sizes allows the discharged material to be quickly discharged to the outside of the battery 1100, reducing the risk of pressure building up inside the housing 10.

[0270] In another embodiment of the present application, as shown in FIG. 9 , the housing 10 further includes a bottom plate 15, the partition 50 is supported on the bottom plate 15 by a spacing element 60, the battery module 20 is located above the partition 50, and the first pressure release means 215 is located at the bottom of the battery cell 21.

[0271] When the battery 1100 is in use, the bottom plate 15 may refer to the bottom plate of the housing 10, the partition 50 is supported on the bottom plate 15 by the spacing element 60, and the partition 50 is supported by the spacing element 60, so that a gap exists between the partition 50 and the bottom plate 15, which makes it easy to establish a first sub-pressure release passage 31 between the partition 50 and the bottom plate 15.

[0272] By adopting the technical solution of this embodiment, the first pressure release means 215 is located at the bottom of the battery cell 21, and at the same time, the battery module 20 and the first sub-pressure release means are separated by the partition 50, so that the waste released from the first pressure release means 215 is unlikely to come into contact with the electrical components at the top of the battery cell 21, which reduces the risk of damage to the battery cell 21 and helps improve the use reliability of the battery 1100.

[0273] In another embodiment, as shown in Figures 28 and 35, the first pressure release means 215 may be located on the side of the battery cell 21, or the first pressure release means 215 may be located on the top of the battery cell 21, and the partition 50, the spacing element 60, the first sub-pressure release passage 31 and the second sub-pressure release passage 34 may be designed accordingly according to the position of the first pressure release means 215, which can be specifically designed according to actual needs.

[0274] In another embodiment of the present application, the divider 50 is a thermal management member for exchanging heat with the battery module 20 .

[0275] The thermal management member may refer to a member that exchanges heat with the battery cells 21, such as a liquid cooling plate.

[0276] According to the technical solution of this embodiment, the partition 50 is itself a thermal management member, thus eliminating the need for additional members, which helps reduce the number of parts in the battery 1100 and facilitates processing and manufacturing.

[0277] In another embodiment of the present application, referring to FIG. 13 , the cross-sectional area of ​​the filter hole 401 with the largest pore size is S, and the shortest discharge path between the first pressure release means 215 and the second pressure release means 16 of at least one battery cell 21 is L, in this case:

number

[0278] As can be understood, the cross-sectional area of ​​the filter hole 401 with the largest pore diameter is the cross-sectional area of ​​the filter hole 401 with the largest pore diameter among the filter holes 401.

[0279] The shortest discharge path between the first pressure release means 215 and the second pressure release means 16 of at least one battery cell 21 is defined as L, and for ease of understanding, the length of the shortest discharge path among the multiple discharge paths through which the discharged matter released from the first pressure release means 215 of the battery cell 21 flows to the second pressure release means 16 is defined as L.

[0280] Generally, when the battery cell 21 experiences thermal runaway, the longer the length L of the shortest discharge path of the battery cell 21, the longer the cooling time for the particulate matter in the discharged matter, the lower the temperature at which the particulate matter is discharged from the housing, the lower the requirements for the filtering function of the filter member 40, and the larger the cross-sectional area of ​​the filter hole 401 with the largest pore diameter of the filter member 40 can be designed.

[0281] By adopting the technical solutions of the embodiments,

number

number

number

[0282] As shown in FIG. 26 , when the battery 1100 is in use, the first pressure release means 215 of the battery cell 21 may typically be located on the top, side, or bottom of the battery cell 21. For example, as shown in FIGS. 26 a), 26 b, and 26 e, when the first pressure release means 215 is located on the top of the battery cell 21, the positive electrode terminal 214 a and the negative electrode terminal 214 b of the battery cell 21 may be located on the top of the battery cell 21, on the same side of the battery cell 21, or on opposite sides of the battery cell 21. As shown in FIG. 26 c, when the first pressure release means 215 is located on the side of the battery cell 21, one of the positive electrode terminal 214 a and the negative electrode terminal 214 b of the battery cell 21 is located on the same side of the battery cell 21 as the first pressure release means 215, and the other is located on the other side of the battery cell 21 opposite the first pressure release means 215. As shown in FIG. 26d), when the first pressure release means 215 is located at the bottom of the battery cell 21, the positive electrode terminal 214a and the negative electrode terminal 214b of the battery cell 21 may be located at the top of the battery cell 21.

[0283] When different types of battery cells 21 are installed in the housing 10, the shortest discharge path of the battery cells 21 will be different. Below, we will describe the shortest path between the first pressure release means 215 and the second pressure release means 16 of the battery cells 21 through several specific examples.

[0284] In a specific embodiment, as shown in FIGS. 27 to 29, the housing 10 includes a top cover 13, a frame 14, and a bottom plate 15. The top cover 13 and the bottom plate 15 are respectively provided on the upper and lower sides of the frame 14 to form a surrounding storage space for storing the battery cells 21. The frame 14 is a rectangular frame. The battery module 20 includes a row of battery cells 21 arranged along the length direction (X direction) of the housing 10. The front and rear of the two second pressure release means 16 are separated by a rectangular frame. The battery module 20 includes a first pressure release means 215 on the left wall of the frame 14, and a first pressure release means 215 is provided on the top of each battery cell 21. A first exhaust passage 101 is formed between the top surface of the battery cell 21 and the top cover 13, and an annular passage 33 is formed by being surrounded by the peripheral wall of the battery module 20 and the inner peripheral wall of the frame 14. Exhaust released from the first pressure release means 215 passes through the first exhaust passage 101 and flows into the annular passage 33, and then passes through the annular passage 33 to move to the second pressure release means 16.

[0285] For ease of explanation, the discharge path of the leftmost battery cell 21 will be selected as an example for explanation. The discharged matter from the battery cell 21 has multiple discharge paths after being released, and the dotted arrows in FIG. 28 schematically show three discharge paths through which the discharged matter from the battery cell 21 is discharged to the second pressure release means 16 via the first pressure release means 215. After the first pressure release means 215 of the battery cell 21 discharges the discharged matter, the discharge path through which the discharged matter moves diagonally leftward to the second pressure release means 16 located at the front is called the third discharge path S, the discharge path through which the discharged matter moves leftward to the second pressure release means 16 located at the rear is called the fourth discharge path S', and the discharge path through which the discharged matter moves forward to the second pressure release means 16 located at the front is called the fifth discharge path S". The lengths of the fourth discharge path S' and the fifth discharge path S" are both longer than the length of the third discharge path S, and the third discharge path S may be the shortest discharge path.

[0286] The length L of the third exhaust path S can be measured as follows: the projection point of the center of the first pressure release means 215 on the top surface of the battery cell 21 is the first projection point, the projection point of the center of the second pressure release means 16 on the top surface of the battery cell 21 is the second projection point, the connecting line between the first projection point and the second projection point is the first connecting line, the projection line of the edge of the first pressure release means 215 on the top surface of the battery cell 21 is the first projection line, the intersection of the first connecting line and the first projection line is the first intersection point, and the intersection of the first connecting line and the left side surface of the battery cell 21 is the second intersection point, the distance between the first intersection point and the center of the first pressure release means 215 is L1, the distance between the first intersection point and the second intersection point is L2, and the distance between the second intersection point and the center of the second pressure release means 16 is L3, where L = L1 + L2 + L3.

[0287] 30 to 32, this embodiment differs from the previous embodiments in the following respects: there is one second pressure release means 16, the second pressure release means 16 is located on the right wall of the frame 14, an enclosure 80 is provided between the top of the battery cells 21 and the top cover 13, the enclosure 80 is provided to surround the first pressure release means 215 of one row of battery cells 21, the opening of the U-shaped enclosure 80 faces rightward, and the waste released from the first pressure release means 215 flows along the path surrounded by the enclosure 80, through the opening of the enclosure 80, into the annular passage 33, and then flows through the annular passage 33 to the second pressure release means 16.

[0288] For ease of explanation, the discharge path of the leftmost battery cell 21 will be selected as an example for explanation. The discharged matter from this battery cell 21 has multiple discharge paths after being released, and the dotted arrows in Figure 31 schematically show two discharge paths through which the discharged matter from this battery cell 21 is discharged to the second pressure release means 16 via the first pressure release means 215. The discharge path through which the discharged matter released from the first pressure release means 215 of this battery cell 21 is discharged forward after being discharged from the opening of the enclosing member 80 is referred to as the third discharge path S, and the discharge path through which the discharged matter is discharged backward after being discharged from the opening is referred to as the fourth discharge path S'. The length of the third discharge path S is shorter than the length of the fourth discharge path S', and the third discharge path S may be the shortest discharge path.

[0289] The length L of the third discharge path S can be measured by the following method: the projection point of the center of the first pressure release means 215 on the top surface of the battery cell 21 is the first projection point, the projection point of the center of the second pressure release means 16 on the top surface of the battery cell 21 is the second projection point, the projection line of the edge of the first pressure release means 215 on the top surface of the battery cell 21 is the first projection line, the intersection line between the left wall surface of the front frame bar of the enclosing member 80 and the top surface of the battery cell 21 is the first intersection line, the connecting line between the rear end point of the first intersection line and the first projection point is the second connecting line, and the intersection point of the first projection line and the second connecting line is the third intersection line. The connecting line between the front end point of the first intersection line and the second projection point is the third connecting line, the intersection point between the third connecting line and the right side surface of the rightmost battery cell 21 is the fourth intersection point, the distance between the center of the first pressure release means 215 and the third intersection point is L4, the distance between the third intersection point and the rear end point of the first intersection line is L5, the length of the first intersection line is L6, the distance between the fourth intersection point and the front end point of the first intersection line is L7, and the distance between the center of the second pressure release means 16 and the fourth intersection point is L8, where L = L4 + L5 + L6 + L7 + L8.

[0290] 33 , this embodiment differs from the previous embodiments in the following respects: the battery module 20 includes two rows of battery cells 21 distributed front to back, each row of battery cells 21 arranged in the length direction (X direction) of the housing 10, and the two rows of battery cells 21 arranged in the width direction (Y direction) of the housing 10. The two rows of battery cells 21 are divided into four regions, front to back, left to right, and each region is provided with a corresponding enclosure member 80. A second pressure release means 16 is provided on each of the left and right sides of the frame 14. An opening is formed in the rear wall of each enclosure member 80, and the gap between two adjacent enclosure members 80 is defined to form a second exhaust passage 102. Exhaust gases emitted by the battery cells 21 due to thermal runaway flow through the opening in the corresponding enclosure member 80 into the second exhaust passage 102, pass through the second exhaust passage 102 into the annular passage 33, and finally flow to the second pressure release means 16.

[0291] For ease of explanation, the discharge path of the battery cell 21 located at the front on the far left will be selected as an example for explanation. The discharged material from the battery cell 21 has multiple discharge paths after being released, and the dotted arrows in Figure 33 show a schematic diagram of three discharge paths through which the discharged material from the battery cell 21 is discharged to the second pressure release means 16 via the first pressure release means 215. The discharge path through which the waste material is discharged from the opening of the left front enclosing member 80 and then discharged to the second pressure release means 16 located on the left side when facing left is called the third discharge path S, the discharge path through which the waste material is discharged from the opening of the left front enclosing member 80 and then discharged to the second pressure release means 16 located on the left side when facing right is called the fourth discharge path S', and the discharge path through which the waste material is discharged from the opening of the left front enclosing member 80 and then discharged to the second pressure release means 16 located on the right side when facing right is called the fifth discharge path S'', and the lengths of the fourth discharge path S' and the fifth discharge path S'' are both longer than the length of the third discharge path S, so the third discharge path S may be called the shortest discharge path.

[0292] The length L of the third discharge path S can be measured by the following method: the projection point of the center of the first pressure release means 215 on the top surface of the battery cell 21 is the first projection point, the projection point of the center of the second pressure release means 16 on the top surface of the battery cell 21 is the second projection point, the projection line of the edge of the first pressure release means 215 on the top surface of the battery cell 21 is the first projection line, the intersection line between the right wall surface of the left rear frame bar of the enclosing member 80 and the top surface of the battery cell 21 is the second intersection line, and the intersection line between the rear wall surface of the left rear frame bar of the enclosing member 80 and the top surface of the battery cell 21 is the third projection line. The intersection line with the top surface is the third intersection line, the connecting line between the first projection point and the front end point of the second intersection line is the fourth connecting line, the intersection point of the fourth connecting line and the first projection line is the fifth intersection line, the connecting line between the second projection point and the left end point of the third intersection line is the fifth connecting line, the intersection point of the fifth connecting line and the left side surface of the leftmost battery cell 21 is the sixth intersection line, the distance between the center of the first pressure release means 215 and the fifth intersection line is L9, and the distance between the fifth intersection line and the front end point of the second intersection line is L 10 , the length of the second intersection line is L 11 , the length of the third intersection line is L 12 , the distance between the 6th intersection and the left end point of the 3rd intersection line is L 13 , the distance between the sixth intersection and the center of the second pressure release means 16 is L 14 where L=L9+L10 +L 11 +L 12 +L 13 +L 14 is.

[0293] 34 , this embodiment differs from the previous embodiments in the following respects: the battery module 20 includes two rows of battery cells 21 distributed front to back, and the two rows of battery cells 21 are divided into two left and right regions, each of which is provided with a corresponding enclosure 80, with openings in the two enclosures 80 facing each other, and second pressure release means 16 are provided on both the left and right sides of the frame 14, and a second exhaust passage 102 is formed between two adjacent enclosures 80, so that exhaust gases emitted by the battery cells 21 due to thermal runaway flow through the corresponding openings in the enclosures 80 into the second exhaust passage 102, pass through the second exhaust passage 102 into the annular passage 33, and finally flow to the second pressure release means 16.

[0294] For ease of explanation, the discharge path of the battery cell 21 located at the front on the far left will be selected as an example for explanation. The discharged material from the battery cell 21 has multiple discharge paths after being released, and the dotted arrows in Figure 34 show a schematic diagram of three discharge paths through which the discharged material from the battery cell 21 is discharged to the second pressure release means 16 via the first pressure release means 215. The discharge path along which the discharged material is discharged from the opening of the left-side enclosing member 80 and then discharged forward to the second pressure release means 16 located on the left side is called the third discharge path S, the discharge path along which the discharged material is discharged from the opening of the left-side enclosing member 80 and then discharged rearward to the second pressure release means 16 located on the left side is called the fourth discharge path S', and the discharge path along which the discharged material is discharged from the opening of the left-side enclosing member 80 and then discharged rearward to the second pressure release means 16 located on the right side is called the fifth discharge path S'', and the lengths of the fourth discharge path S' and the fifth discharge path S'' are both longer than the length of the third discharge path S, so the third discharge path S may be the shortest discharge path.

[0295] The length L of the third discharge path S can be measured by the following method: the projection point of the center of the first pressure release means 215 on the top surface of the battery cell 21 is the first projection point, the projection point of the center of the second pressure release means 16 on the top surface of the battery cell 21 is the second projection point, the projection line of the edge of the first pressure release means 215 on the top surface of the battery cell 21 is the first projection line, the intersection line between the rear wall surface of the right front frame bar of the enclosing member 80 and the top surface of the battery cell 21 is the fourth intersection line, and the intersection line between the right wall surface of the right front frame bar of the enclosing member 80 and the top surface of the battery cell 21 is the fourth projection line. The fifth intersection line is the intersection line between the front wall surface of the front frame bar of the enclosing member 80 and the top surface of the battery cell 21, the sixth intersection line is the connection line between the first projection point and the left end point of the fourth intersection line, the sixth connection line is the connection line between the first projection point and the left end point of the sixth intersection line, the seventh intersection line is the connection line between the second projection point and the left end point of the sixth intersection line, the seventh connection line is the connection line between the second projection point and the left end point of the sixth intersection line, the eighth intersection line is the connection line between the seventh connection line and the left side surface of the leftmost front battery cell 21, and the distance between the center of the first pressure release means 215 and the seventh intersection line is L 15 , the distance between the 7th intersection and the left end point of the 4th intersection line is L 16 , the length of the fourth intersection line is L 17 , the length of the fifth intersection line is L 18 , the length of the sixth intersection line is L 19 , the distance between the 8th intersection and the left end point of the 6th intersection line is L 20 , the distance between the eighth intersection and the center of the second pressure release means 16 is L 21 where L=L 15 +L 16 +L 17 +L 18 +L 19 +L 20 +L 21 is.

[0296] In one specific embodiment, as shown in Figures 35 to 37, the battery module 20 includes a row of battery cells 21 arranged in the length direction (X direction) of the housing 10, and a first pressure release means 215 is provided on the front side of each battery cell 21, and two second pressure release means 16 are provided on the front and rear sides of the left wall of the frame 14, and an annular passage 33 is formed between the row of battery cells 21 and the inner wall of the frame 14, and waste released when the battery cells 21 experience thermal runaway flows through the annular passage 33 to the second pressure release means 16.

[0297] For ease of explanation, the discharge path of the leftmost battery cell 21 will be selected as an example for explanation. The discharged material from this battery cell 21 has multiple discharge paths after being released, and the dotted arrows in Figure 36 schematically show three discharge paths through which the discharged material from this battery cell 21 is discharged to the second pressure release means 16 via the first pressure release means 215. The discharge path through which the discharged material is discharged leftward to the second pressure release means 16 located at the front is called the third discharge path S, the discharge path through which the discharged material is discharged rightward to the second pressure release means 16 located at the front is called the fourth discharge path S', and the discharge path through which the discharged material is discharged leftward to the second pressure release means 16 located at the rear is called the fifth discharge path S". The lengths of the fourth discharge path S' and the fifth discharge path S" are both longer than the length of the third discharge path S, and the third discharge path S may be the shortest discharge path.

[0298] The length L of the third discharge path S can be measured by the following method: the projection point of the center of the first pressure release means 215 on the front side surface of the battery cell 21 is the first projection point, the projection point of the center of the second pressure release means 16 on the front side surface of the battery cell 21 is the second projection point, the projection line of the edge of the first pressure release means 215 on the front side surface of the battery cell 21 is the first projection line, the connecting line between the first projection point and the second projection point is the eighth connecting line, the intersection of the eighth connecting line and the first projection line is the ninth intersection, and the intersection of the eighth connecting line and the left side surface of the battery cell 21 is the tenth intersection, and the distance between the center of the first pressure release means 215 and the ninth intersection is L. 22 , the distance between the 8th and 10th intersections is L 23 , the distance between the center of the second pressure release means 16 and the tenth intersection point is L 24 where L=L 22 +L 23 +L 24 is.

[0299] In a specific embodiment, as shown in Figures 38 to 40, the battery module 20 includes a row of battery cells 21 arranged in the longitudinal direction (X direction) of the housing 10, and a first pressure release means 215 is provided at the bottom of each battery cell 21, and two second pressure release means 16 are provided on the front and rear sides of the left wall of the frame 14, an annular passage 33 is formed between the battery module 20 and the inner wall of the frame 14, and the annular passage 33 also extends between the divider and the inner wall of the frame 14, the battery cells 21 are supported on the bottom plate 15 by a partition 50, and a first sub-pressure release passage 31 is formed between the partition 50 and the bottom plate 15, and a plurality of first ventilation structures 51 are opened in the partition 50, and each of the plurality of first ventilation structures 51 is connected one-to-one to the first pressure release means 215 of each battery cell 21. The waste released when the battery cell 21 experiences thermal runaway flows through the first sub-pressure release passage 31 and the annular passage 33 to the second pressure release means 16, where the first breathable structure 51 is a through-hole and the partition 50 is a liquid-cooled plate.

[0300] For ease of explanation, the discharge path of the leftmost battery cell 21 will be selected as an example for explanation. The discharged material from this battery cell 21 has multiple discharge paths after being released, and the dotted arrows in Figure 39 schematically show three discharge paths through which the discharged material from this battery cell 21 is discharged to the second pressure release means 16 via the first pressure release means 215. The discharge path through which the discharged material is discharged leftward to the second pressure release means 16 located at the rear is called the third discharge path S, the discharge path through which the discharged material is discharged rightward to the second pressure release means 16 located at the rear is called the fourth discharge path S', and the discharge path through which the discharged material is discharged leftward to the second pressure release means 16 located at the front is called the fifth discharge path S". The lengths of the fourth discharge path S' and the fifth discharge path S" are both longer than the length of the third discharge path S, and the third discharge path S may be the shortest discharge path.

[0301] The length L of the third discharge path S can be measured by the following method: the projection point of the center of the first pressure release means 215 on the bottom surface of the partition 50 is the first projection point, the projection point of the center of the second pressure release means 16 on the bottom surface of the partition 50 is the second projection point, the projection line of the edge of the first pressure release means 215 on the bottom surface of the partition 50 is the first projection line, the connecting line between the first projection point and the second projection point is the ninth connecting line, the intersection point between the ninth connecting line and the first projection line is the eleventh intersection point, and the intersection point between the ninth connecting line and the left wall surface of the partition 50 is the twelfth intersection point, and the distance between the center of the first pressure release means 215 and the eleventh intersection point is L. 25 , the distance between the 11th and 12th intersections is L 26 , the distance between the 12th intersection point and the center of the second pressure release means 16 is L 27 where L=L 25 +L 26 +L 27 is.

[0302] 10 and 13 , this embodiment differs from the previous embodiments in the following respects: A battery module 20 includes two rows of battery cells 21 arranged in the width direction (Y direction) of the housing 10. Both ends of the battery cells 21 in each row are connected to end plates 22. The battery cells 21 are supported by partitions 50, which are supported on the bottom plate 15 by spacing elements 60. The number of spacing elements 60 is three. Two first sub-pressure release passages 31 are formed by the three spacing elements 60 and extend along the width direction (Y direction) of the housing 10. The two first sub-pressure release passages 31 are connected to the first pressure release means 215 of the two rows of battery cells 21, respectively. Each row of battery cells 21 is connected to a corresponding first sub-pressure release passage 31. Waste released during thermal runaway of the battery cells 21 flows through the first sub-pressure release passage 31 and the annular passage 33 to the second pressure release means 16. In some embodiments, the first air-permeable structure 51 is a through hole and the partition 50 is a liquid-cooled plate.

[0303] For ease of explanation, the discharge path of the battery cell 21 located at the front on the far right will be selected as an example for explanation. The discharged material from the battery cell 21 has multiple discharge paths after being released, and the dotted arrows in Figure 13 schematically show three discharge paths through which the discharged material from the battery cell 21 is discharged to the second pressure release means 16 via the first pressure release means 215. The discharge path through which the discharged material released from the battery cell 21 is discharged to the second pressure release means 16 located at the front facing right is called the third discharge path S, the discharge path through which the discharged material is discharged to the second pressure release means 16 located at the rear facing right is called the fourth discharge path S', and the discharge path through which the discharged material is discharged to the second pressure release means 16 located at the front facing left is called the fifth discharge path S". The lengths of the fourth discharge path S' and the fifth discharge path S" are both longer than the length of the third discharge path S, and the third discharge path S may be the shortest discharge path.

[0304] The length L of the third exhaust path S can be measured by the following method: the projection point of the center of the first pressure release means 215 on the bottom surface of the partition 50 is the first projection point, the projection point of the center of the second pressure release means 16 on the bottom surface of the partition 50 is the second projection point, the projection line of the edge of the first breathable structure 51 on the bottom surface of the partition 50 is the first projection line, the connecting line between the first projection point and the second projection point is the tenth connecting line, the intersection of the tenth connecting line and the first projection line is the thirteenth intersection, the intersection of the right wall of the partition 50 and the tenth connecting line is the fourteenth intersection, and the intersection of a plane that passes through the tenth connecting line and is perpendicular to the bottom surface of the partition 50 with the lower edge line of the right wall surface of the right end plate 22 is the fifteenth intersection, and the distance between the center of the first pressure release means 215 and the thirteenth intersection is L. 28 , the distance between the 13th and 14th intersections is L 29 , the distance between the 14th and 15th intersections is L 30 , the distance between the center of the second pressure release means 16 and the 15th intersection point is L 31 where L=L 28 +L 29 +L 30 +L 31 is.

[0305] 15 and 16, this embodiment differs from the previous embodiments in the following respects: the end plate 22 of the battery module 20 extends into the annular passage 33 and forms a sealed structure with the bottom plate 15, the number of spacing elements 60 is twelve, the twelve spacing elements 60 are arranged in a matrix and surrounded by each other to form two first sub-pressure release passages 31 and three second sub-pressure release passages 34, the first sub-pressure release passage 31 extends along the width direction (Y direction) of the housing 10, the two first sub-pressure release passages 31 are spaced apart along the width direction (Y direction) of the housing 10, the second sub-pressure release passage 34 extends along the width direction (Y direction) of the housing 10, and the three second sub-pressure release passages 34 are spaced apart along the length direction (X direction) of the housing 10. The waste matter released from the battery cells 21 cannot flow rightward through the end plate 22 and into the annular passage 33, but must flow along the first sub-pressure release passage 31 into the second sub-pressure release passage 34, pass through the second sub-pressure release passage 34 to the annular passage 33, and finally flow to the second pressure release means 16.

[0306] For ease of explanation, the discharge path of the battery cell 21 located at the far right and closest to the front will be selected as an example for explanation. The discharged material from the battery cell 21 has multiple discharge paths after being released, and the dotted arrows in Figure 15 schematically show three discharge paths through which the discharged material from the battery cell 21 is discharged to the second pressure release means 16 via the first pressure release means 215. The discharge path through which the discharged material released from the battery cell 21 is discharged forward to the second pressure release means 16 located at the front is called the third discharge path S, the discharge path through which the discharged material is discharged rearward to the second pressure release means 16 located at the rear is called the fourth discharge path S', and the discharge path through which the discharged material is discharged rearward to the second pressure release means 16 located at the front is called the fifth discharge path S". The lengths of the fourth discharge path S' and the fifth discharge path S" are both longer than the length of the third discharge path S, and the third discharge path S may be the shortest discharge path.

[0307] The length L of the third exhaust path S can be measured by the following method: the projection point of the center of the first pressure release means 215 on the bottom surface of the partition 50 is the first projection point, the projection point of the center of the second pressure release means 16 on the front wall surface of the rightmost front spacing element 60 is the second projection point, the projection line of the edge of the first breathable structure 51 on the bottom surface of the partition 50 is the first projection line, the intersection line between the left wall surface of the rightmost front spacing element 60 and the bottom surface of the partition 50 is the seventh intersection line, the connecting line between the rear end point of the seventh intersection line and the first projection point is the eleventh connecting line, the intersection point between the eleventh connecting line and the first projection line is the sixteenth intersection point, the connecting line between the front end point of the seventh intersection line and the second projection point is the twelfth connecting line, the intersection point between the right wall surface of the right end plate 22 and the twelfth connecting line is the seventeenth intersection point, and the distance between the center of the first pressure release means 215 and the sixteenth intersection point is L. 32 , the distance between the 16th intersection and the rear end point of the 7th intersection line is L 33 , the length of the seventh intersection line is L 34 , the distance between the front end point of the 7th intersection line and the 17th intersection line is L 35 , the distance between the 17th intersection and the center of the second pressure release means 16 is L 36 where L=L 32 +L 33 +L 34 +L 35 +L 36 is.

[0308] 18, 20, and 22, this embodiment differs from the previous embodiments in the following respects: An annular member 70 is provided within the annular passage 33, dividing the annular passage 33 into a first sub-annular passage 331 and a second sub-annular passage 332. Second ventilation structures 71 are provided in the centers of the front and rear walls of the annular member 70, connecting the first sub-annular passage 331 and the second sub-annular passage 332. The second ventilation structures 71 are through-holes. In this manner, waste released from the battery cells 21 is discharged through the second sub-pressure release passage 34, enters the first sub-annular passage 331, passes through the second ventilation structure 71, and enters the second sub-pressure release passage 34, and finally flows along the second sub-pressure release passage 34 to the second pressure release means 16. As shown in FIG. 18, the third discharge path S extends from the second sub-pressure release passage 34, enters the first sub-annular passage 331, then passes through the second breathable structure 71, enters the second sub-pressure release passage 34, and finally flows to the second pressure release means 16.

[0309] The length L of the third discharge path S can be measured by the following method: the projection point of the center of the second pressure release means 16 on the front wall surface of the front wall portion 72 of the annular member 70 is the second projection point, the projection point of the center of the first breathable structure 51 on the front wall surface of the front wall portion 72 of the annular member 70 is the third projection point, the connecting line between the second projection point and the third projection point is the thirteenth connecting line, the intersection point of the right wall surface of the right side wall portion 72 of the annular member 70 and the thirteenth connecting line is the eighteenth intersection point, and the distance between the front end point of the seventh intersection line and the third projection point is L. 37 , the distance between the third projection point and the 18th intersection is L 38 , the distance between the 18th intersection and the center of the second pressure release means 16 is L 39 where L=L 32 +L 33 +L 34 +L 37 +L 38 +L 39 is.

[0310] In another embodiment of the present application, as shown in FIGS. 10 and 13, the cross-sectional area of ​​the filter hole 401 with the largest pore size is S, and the length of the shortest discharge path between the first pressure release means 215 and the second pressure release means 16 of any one battery cell 21 is L. In this case,

number

[0311] The first pressure release means 215 of any one battery cell 21 can be understood as the first pressure release means 215 of each battery cell 21, that is, the shortest discharge path between the first pressure release means 215 and the second pressure release means 16 of each battery cell 21 satisfies the above equation.

[0312] By adopting the technical solution of this embodiment, the shortest discharge path L of each battery cell 21 and the cross-sectional area S of the filter hole 401 with the largest pore diameter in the filter member 40 are both within a reasonable design range, which better improves the usage reliability of the battery 1100.

[0313] In another embodiment of the present application,

number

[0314] By adopting the technical solution of this embodiment, the shortest discharge path L of the battery cell 21 and the cross-sectional area S of the filter hole 401 with the largest pore diameter of the filter member 40 are both within a more reasonable design range, the risk of causing the exhaust temperature of the battery 1100 to be too high is reduced, and the use reliability of the battery 1100 is higher.

number

[0315] In some embodiments,

number

[0316] In another embodiment of the present application,

number

[0317] By adopting the technical solution of this embodiment, the length of the shortest exhaust path is within this range, so that the shortest exhaust path is not designed to be too short, which would shorten the cooling time of the granules and cause the temperature of the granules discharged from the battery 1100 to be high, which would easily cause the deterioration of the external environment of the battery 1100; and the shortest exhaust path is not designed to be too long, which would prolong the exhaust time and cause the pressure to be released in a timely manner, which would cause the casing 10 to explode.

[0318] In some embodiments, the value of L may be, but is not limited to, 0.05 m, 0.1 m, 0.5 m, 2 m, 2.5 m, 3 m, 3.5 m, or 4 m.

[0319] Table 1 below shows the parameters of the length L of the shortest discharge path used in some experiments, the parameters of the cross-sectional area S of the filter hole 401 with the largest pore size, and the experimental results. The specific method of the experiment is the method described in GB 38031-2020, and detailed description is omitted here.

[0320] [Table 1]

[0321] As can be seen from the above table,

number

number

number

number

number

[0322] In another embodiment, let E be the volumetric energy density of the battery 1100 and S be the cross-sectional area of ​​the largest pore size filter pore 401, in which case:

number

[0323] The volumetric energy density of the battery 1100 may refer to the energy contained within the unit volume of the battery 1100, and in the actual use process, the volumetric energy density of the battery 1100 can be read directly from the nameplate of the battery 1100.

[0324] Generally, as the volumetric energy density of the battery 1100 increases, the degree of thermal runaway of the battery 1100 becomes more severe, and the battery cells 21 release waste more vigorously, causing the waste to flow along the pressure release passage 30 to the second pressure release means 16 at higher temperatures and at higher speeds, increasing the risk of the temperature of the battery 1100 becoming too high. This increases the requirements for the filtering function of the filter member 40, and the cross-sectional area of ​​the filter hole 401, which has the largest pore size, of the filter member 40 may also be designed to be smaller.

[0325] By adopting the technical solutions of the embodiments,

number

number

number

[0326] In another embodiment,

number

[0327] By adopting the technical solution of this embodiment, the cross-sectional area S of the filter hole 401 with the largest pore size of the filter member 40 and the volumetric energy density E of the battery 1100 are more reasonably designed, the risk of the temperature of the external exhaust of the battery 1100 becoming too high is reduced, and the use reliability of the battery 1100 is higher.

number

[0328] In some embodiments,

number

[0329] In another embodiment,

number

[0330] By adopting the technical solution of this embodiment, the volumetric energy density E of most batteries 1100 is within the above range, so the above formula can be applied to most batteries 1100 and has a wide range of application.

[0331] In one embodiment, the value of E may be, but is not limited to, 400 Wh / L, 450 Wh / L, 500 Wh / L, 550 Wh / L, 600 Wh / L, 650 Wh / L, 700 Wh / L, 750 Wh / L, or 800 Wh / L.

[0332] In another embodiment,

number

[0333] By adopting the technical solution of this embodiment, the cross-sectional area S of the filter hole 401 with the largest pore size is within the above range, so that the filter member 40 can effectively block most of the high-temperature particulate matter and reduce the risk of the exhaust temperature of the battery 1100 becoming too high. If the cross-sectional area S of the filter hole 401 with the largest pore size is designed to be too small, the particulate matter will easily clog the filter member 40, preventing timely pressure relief and easily causing serious damage to the housing 10. If the cross-sectional area S of the filter hole 401 with the largest pore size is designed to be too large, large, high-temperature particulate matter will easily penetrate the filter member 40, causing the exhaust temperature of the battery 1100 to become too high.

[0334] In another embodiment,

number

[0335] By adopting the technical solution of this embodiment, the cross-sectional area of ​​the filter hole 401 with the largest pore diameter can be more rationally designed, which can further reduce the risk of the exhaust temperature of the battery 1100 becoming too high.

[0336] In one embodiment, the value of S is 0.06 mm 2 , 0.1mm 2 , 0.15mm 2 , 0.2mm 2 , 0.25mm 2 , 0.3mm 2 , 1mm 2 , 2mm2 , 3mm 2 , 4mm 2 , 5mm 2 , 6mm 2 , 6.25mm 2 , 7mm 2 , 8mm 2 , 9mm 2 , 10mm 2 , 12mm 2 , 14mm 2 , 16mm 2 , 18mm 2 , 20mm 2 , 22mm 2 , 24mm 2 or 25mm 2 It may be, but is not limited to,

[0337] Table 2 below shows the parameters of the volumetric energy density E of the battery 1100 used in some experiments, the parameters of the cross-sectional area S of the filter hole 401 with the largest pore size, and the experimental results. The specific method of the experiment is the method described in GB 38031-2020, and detailed description is omitted here.

[0338] [Table 2]

[0339] As can be seen from the above table,

number

number

number

number

number

[0340] In the battery of the embodiment of the present application, the structure of the filter member 40 is rationally designed to effectively block high-temperature particulate matter in the discharged liquid due to thermal runaway of the battery, and to reduce the risk of irregular pressure release and even explosion of the battery 1100 due to clogging by particulate matter.

[0341] In another embodiment of the present application, there is provided a power-using device further comprising the battery 1100 of the above embodiment.

[0342] The above description of each embodiment tends to emphasize the differences between the embodiments, and the same or similar parts may be cross-referenced, and for the sake of brevity, detailed descriptions will be omitted in this specification.

[0343] The above is merely a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the scope of the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. The housing and a battery module located within the housing, the battery module including at least one battery cell, each battery cell being provided with a first pressure release means, and the housing being provided with a second pressure release means; a pressure release passage connecting the first pressure release means and the second pressure release means of at least one of the battery cells, wherein the first pressure release means, when activated, is used to release waste generated inside the battery cell to the pressure release passage, and the pressure release passage is used to guide the waste to the second pressure release means, and the second pressure release means, when activated, is used to release the waste in the pressure release passage to the outside of the housing; At least one of the battery cells, the battery modules, the housing, and the pressure release passage is provided with a filter member having filter holes for preventing particulate matter in the discharged liquid from passing through.

2. When the filtering member is provided in the battery cell, the first pressure release means and the filtering member are integrated into one structure, or the filtering member is connected to a case of the battery cell; 2. The battery of claim 1, wherein, when the filtering member is provided in the housing, the second pressure release means and the filtering member are an integrated structure, or the filtering member is connected to the housing, or the filtering hole is provided in the side wall of the housing, and the portion of the side wall of the housing where the filtering hole is provided forms the filtering member.

3. 3. The battery according to claim 1, wherein, when the filter member is provided in the housing, the filter member is provided on a side of the second pressure release means facing the battery module to prevent the particulate matter released from the battery cells from entering the second pressure release means, and / or the filter member is provided on a side of the second pressure release means facing away from the battery module to prevent the particulate matter released from the second pressure release means from passing through.

4. the sum of the cross-sectional areas of all the filter holes of the filter member is a filtering area; when the filtering member is provided on a side of the second pressure release means facing the battery module, the filtering member located on the side of the second pressure release means facing the battery module is a first filtering member, and the filtering area of ​​the first filtering member is larger than the maximum pressure release area of ​​the second pressure release means, 4. The battery according to claim 3, wherein, when the filter member is provided on the side of the second pressure release means facing away from the battery module, the filter member located on the side of the second pressure release means facing away from the battery module is a second filter member, and the filtering area of ​​the second filter member is smaller than the maximum pressure release area of ​​the second pressure release means.

5. When a plurality of the first filter members are provided on a side of the second pressure release means facing the battery module, the plurality of first filter members are arranged in order along a discharge path of the waste material discharged from the battery cells, and the filtering areas of the plurality of first filter members become smaller along the discharge path of the waste material, 5. The battery according to claim 4, wherein when a plurality of the second filter members are provided on a side of the second pressure release means away from the pressure release passage, the plurality of second filter members are arranged in order along a discharge path of the waste material released from the second pressure release means, and the filtering areas of the plurality of second filter members become smaller along the discharge path of the waste material.

6. when a plurality of the first filter members are provided on a side of the second pressure release means facing the battery module, the pore diameters of the filter holes of the plurality of first filter members become smaller along a discharge path of the discharged matter, 6. The battery according to claim 4, wherein when a plurality of second filter members are provided on the side of the second pressure release means away from the pressure release passage, the pore diameters of the filter holes of the plurality of second filter members become smaller along the discharge path of the discharged matter.

7. 7. The battery according to claim 3, wherein the filtering member and the second pressure release means are spaced apart.

8. The battery of any one of claims 3 to 7, wherein the filtering member includes a plate portion and a ring wall portion arranged around the plate portion, one end of the ring wall portion is connected to the plate portion and the other end of the ring wall portion is connected to the housing, the ring wall portion is arranged around the second pressure release means, and the filtering hole is provided in at least one of the ring wall portion and the plate portion.

9. the filtering member has a first filtering section and a second filtering section, each of which is provided with a plurality of filtering holes, and a first discharge path passing through the filtering holes of the first filtering section and a second discharge path passing through the filtering holes of the second filtering section are formed between the first pressure release means and the second pressure release means of at least one of the battery cells, The battery according to any one of claims 3 to 8, wherein when the length of the first discharge path is greater than the length of the second discharge path, the hole diameter of the filter hole of the first filtration section is greater than the hole diameter of the filter hole of the second filtration section.

10. The battery according to any one of claims 1 to 9, wherein the number of the filter holes is plural, and any two of the filter holes have the same hole diameter, or at least two of the filter holes have different hole diameters.

11. S is the cross-sectional area of ​​the filter hole with the largest hole diameter, and L is the shortest discharge path between the first pressure release means and the second pressure release means of at least one of the battery cells, in this case: [Equation 1] where L is in m and S is in mm ２ 11. The battery of claim 10, wherein:

12. The cross-sectional area of ​​the filter hole with the largest hole diameter is S, and the length of the shortest discharge path between the first pressure release means and the second pressure release means of any one of the battery cells is L. In this case, [Equation 2] where L is in m and S is in mm ２ 12. The battery according to claim 10 or 11, [Request Item 13] [Number 3] 13. The battery according to claim 11 or 12, [Request Item 14] [Number 4] The battery according to any one of claims 11 to 13,

15. The volumetric energy density of the battery is E, and the cross-sectional area of ​​the filter hole with the largest pore diameter is S. In this case, [Equation 5] where E is in Wh / L and S is in mm ２ The battery according to any one of claims 10 to 14, [Request Item 16] [Number 6] 16. The battery of claim 15, wherein: [Request Item 17] [Number 7] 17. The battery according to claim 15 or 16, [Request Item 18] [Number 8] The battery according to any one of claims 11 to 17, [Request Item 19] [Number 9] 20. The battery of claim 18, wherein:

20. The battery of any one of claims 1 to 19, wherein the pressure release passage further includes a first sub-pressure release passage for connecting to the second pressure release means, and the battery further includes a partition for separating the battery module from the first sub-pressure release passage, the partition being provided with a plurality of first air-permeable structures, and each of the first air-permeable structures connects the first pressure release means of at least one of the battery cells to the first sub-pressure release passage.

21. 21. The battery of claim 20, wherein the pressure relief passage includes at least two of the first sub-pressure relief passages, each of which is connected to the first breathable structure corresponding to a different battery cell, and the first sub-pressure relief passages are separated by a spacing element.

22. 22. The battery of claim 21, wherein the pressure release passage further includes a communication passage, the communication passage being formed by being surrounded by the wall surface of the partition and the inner wall surface of the housing, and each of the first sub-pressure release passages being connected to the second pressure release means via the communication passage.

23. 23. The battery of claim 22, wherein the battery module includes at least one row of the battery cells, each row of the battery cells including at least one of the battery cells, each row of the battery cells being provided with at least one of the first sub-pressure release passages corresponding thereto, each of the first sub-pressure release passages extending along the arrangement direction of the battery cells in a corresponding row, and each of the first ventilation structures corresponding to the battery cells in each row being connected to the corresponding first sub-pressure release passage.

24. 24. The battery according to claim 23, wherein the second pressure release means is located on a side of an end of the battery module along an extension direction of the first sub-pressure release passage.

25. 25. The battery according to claim 24, wherein the communication passage is an annular passage formed around the partition.

26. end plates are provided at both ends of at least one row of the battery cells, the end plates being inserted into the annular passage and hermetically connected to an inner wall surface of the housing; 26. The battery of claim 25, wherein the pressure relief passage further includes a second sub-pressure relief passage intersecting the first sub-pressure relief passage, the second sub-pressure relief passage being used to connect the corresponding first sub-pressure relief passage to the annular passage.

27. 27. The battery according to claim 26, wherein the end plates are provided at both ends of the battery cells in each row, and each of the first sub-pressure relief passages communicates with the second sub-pressure relief passage.

28. 28. The battery of claim 26 or 27, wherein the pressure relief passage includes a plurality of the second sub-pressure relief passages, the second sub-pressure relief passages being separated by the spacing element.

29. 29. The battery according to claim 28, wherein the second sub-pressure relief passages are arranged at intervals along the extension direction of the first sub-pressure relief passage.

30. The battery of any one of claims 26 to 29, wherein the first sub-pressure relief passage and the second sub-pressure relief passage are vertical.

31. 31. The battery according to claim 25, wherein the annular passage is provided with an annular member connected to the housing, the annular member being used to divide the annular passage into a first sub-annular passage and a second sub-annular passage arranged around the first sub-annular passage, the annular member having a second ventilation structure for communicating between the first sub-annular passage and the second sub-annular passage, the second sub-annular passage being connected to the second pressure release means, and the first sub-annular passage being in communication with the first sub-pressure release passage.

32. The battery of claim 31 , wherein the second air-permeable structure is a through hole.

33. 33. The battery of claim 31 or 32, wherein the annular member includes at least three side wall portions connected in series, and the side wall portion closest to the second pressure release means is provided with the second breathable structure.

34. 34. The battery of claim 33, wherein when the filtering member is provided in the housing, the side wall portion closer to the second pressure release means becomes the filtering member, and the filtering holes become the second breathable structure.

35. 33. The battery of claim 31 or 32, wherein the annular member includes at least three side wall portions connected in series, the side wall portion remote from the second pressure release means being provided with the second breathable structure.

36. 36. The battery of claim 35, wherein the side wall portion closer to the second pressure release means is a first side wall portion, and at least one of the side wall portion adjacent to the first side wall portion and the side wall portion facing the first side wall portion is provided with the second breathable structure.

37. 37. The battery of claim 35 or 36, wherein the second air-permeable structure is located at the center of the corresponding side wall portion.

38. When the filtering member is provided in the housing, the side wall portion away from the second pressure release means becomes the filtering member, and the filtering hole becomes the second breathable structure. A battery according to any one of claims 35 to 37.

39. The battery according to any one of claims 31 to 33 and 35 to 37, wherein when the filtering member is provided in the housing, the filtering member is covered by the second breathable structure.

40. the filtering member is located between the battery module and the second pressure release means; the filtering member has a first filtering section and a second filtering section, each of which is provided with a plurality of filtering holes, and a first discharge path passing through the filtering holes of the first filtering section and a second discharge path passing through the filtering holes of the second filtering section are formed between the first pressure release means and the second pressure release means of the battery cell closest to the second pressure release means, When the length of the first discharge path is greater than the length of the second discharge path, the hole diameter of the filter hole of the first filtration section is greater than the hole diameter of the filter hole of the second filtration section. The battery according to any one of claims 24 to 34.

41. The battery of any one of claims 21 to 40, wherein the housing further includes a bottom plate, the divider is supported on the bottom plate by the spacing element, the battery module is located above the divider, and the first pressure release means is located at the bottom of the battery cell.

42. 42. The battery of claim 41, wherein the divider is a thermal management member for providing heat exchange with the battery module.

43. A power-using device comprising the battery of any one of claims 1 to 42.

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