Battery pack

Abstract

This invention discloses a battery pack, comprising: a liquid cooling plate having multiple cooling chambers and at least one receiving chamber, the receiving chamber and the cooling chamber being separated from each other, and two cooling chambers respectively arranged on both sides of one receiving chamber; the cooling chambers are used to contain a cooling medium, and the liquid cooling plate is also provided with a first opening communicating with the receiving chamber; a single cell has an explosion-proof valve, which is arranged opposite to the first opening, and the explosion-proof valve is configured such that: when the pressure inside the single cell reaches a set value, the explosion-proof valve opens, and the material ejected from the inside of the single cell through the explosion-proof valve enters the receiving chamber through the first opening; the cooling medium can cool the material in the receiving chamber. The battery pack of this invention can not only effectively cool the material ejected from the single cell through the explosion-proof valve and prevent the spread of thermal runaway, but also has high adaptability.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] In related technologies, explosion-proof valves are installed on batteries to prevent safety accidents caused by thermal runaway. When thermal runaway occurs, the explosion-proof valve releases a large amount of gas and high-temperature particles. The high temperature of the gas and particles released by the explosion-proof valve can raise the temperature of the battery pack, and the large amount of gas and particles can easily cause thermal runaway to spread inside the battery pack, leading to the simultaneous burnout of adjacent batteries.

[0003] Existing battery packs protect adjacent batteries by connecting an explosion-proof valve to a liquid cooling plate, allowing ejected material from the batteries to enter the cooling plate. However, this requires specially designed batteries, resulting in poor pack compatibility. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a battery pack that can not only effectively cool the material ejected from the explosion-proof valve of the individual battery cells and prevent the spread of thermal runaway, but also has high adaptability.

[0005] A battery pack according to a first aspect of the present invention includes:

[0006] A liquid cooling plate has multiple cooling chambers and at least one receiving chamber. The receiving chamber and the cooling chamber are separated from each other along the width direction of the liquid cooling plate, and two cooling chambers are respectively provided on both sides of one receiving chamber. The cooling chamber is used to contain a cooling medium, and the liquid cooling plate is also provided with a first opening communicating with the receiving chamber.

[0007] A single battery cell, wherein the single battery cell has an explosion-proof valve, the explosion-proof valve being disposed opposite to the first opening, the explosion-proof valve being configured such that: when the pressure inside the single battery cell reaches a set value, the explosion-proof valve opens, and material ejected from the inside of the single battery cell through the explosion-proof valve enters the receiving cavity through the first opening; the cooling medium is capable of cooling the material in the receiving cavity.

[0008] The battery pack according to embodiments of the present invention has at least the following beneficial effects: the liquid cooling plate has multiple cooling chambers and at least one receiving chamber, the cooling chambers being used to contain a cooling medium, thereby dissipating heat from the individual cells; when an individual cell experiences thermal runaway due to overheating, the internal pressure of the individual cell reaches the set value of the explosion-proof valve, the explosion-proof valve opens, allowing the ejected material from the individual cell to enter the receiving chamber through a first opening. Thus, the material from the thermal runaway of the individual cell, such as gas and electrolyte, enters the receiving chamber. In the prior art, when an individual cell experiences thermal runaway, the opening of the explosion-proof valve causes gas and electrolyte to spread to adjacent individual cells, thereby affecting the performance of adjacent individual cells and even causing danger. However, in the present application, when an individual cell experiences thermal runaway, the explosion-proof valve opens, allowing the material from the individual cell to enter the receiving chamber. The cooling medium in the cooling chamber can also cool the gas and liquid in the receiving chamber, and because the material ejected from the individual cell enters the receiving chamber, it will not affect or spread to adjacent individual cells. Specifically, the battery pack with individual cells can effectively cool the material ejected from the explosion-proof valve by the individual cells and prevent the spread of thermal runaway. Furthermore, since the receiving cavity and cooling cavity are separated from each other along the width direction of the liquid cooling plate, and two cooling cavities are respectively provided on both sides of each receiving cavity, the receiving cavity can be located in the middle of the width direction of the liquid cooling plate, or it can be located at the end of the width direction of the liquid cooling plate. Thus, the first opening of the receiving cavity can correspond to various types of individual cells, thereby giving the battery pack high adaptability. In essence, the battery pack not only effectively cools the material ejected from the explosion-proof valve by the individual cells and prevents the spread of thermal runaway, but also possesses high adaptability.

[0009] According to some embodiments of the present invention, the battery pack further includes a housing having a storage cavity, wherein the liquid cooling plate and the individual battery cells are disposed within the storage cavity; the housing also has an exhaust channel and an exhaust port that communicate with each other, and the liquid cooling plate is further provided with a second opening that communicates with the housing cavity, the second opening communicating with the exhaust channel, and the exhaust port being located on the side surface of the housing facing away from the storage cavity.

[0010] According to some embodiments of the present invention, in the battery pack, the two ends of the liquid cooling plate are respectively connected to the cavity wall of the storage cavity.

[0011] According to some embodiments of the present invention, in a battery pack, the individual battery cells are connected to the liquid cooling plate, and multiple individual batteries cells and liquid cooling plates are provided. Each liquid cooling plate has a row of individual batteries on both sides. The liquid cooling plate has multiple first openings, and the explosion-proof valve of each individual battery cell is disposed opposite to one of the first openings.

[0012] According to some embodiments of the present invention, the liquid cooling plate includes a first partition that divides the receiving cavity into two independent sub-receiving cavities, and the first opening is disposed on the side of the sub-receiving cavity opposite to the first partition.

[0013] According to some embodiments of the present invention, the battery pack further includes a sealing element having a third opening, with both sides of the sealing element connected to the individual battery cell and the liquid cooling plate, and the first opening and the explosion-proof valve being disposed opposite to the third opening.

[0014] According to some embodiments of the present invention, the liquid cooling plate includes a second partition, the receiving cavity and the cooling cavity are respectively disposed on both sides of the second partition, the second partition includes a weak region and a surrounding region, the surrounding region is connected to the periphery of the weak region, and the thickness of the weak region is less than the thickness of the surrounding region.

[0015] According to some embodiments of the present invention, the battery pack further includes a temperature regulating plate, the explosion-proof valve is disposed at one end of the individual battery cell, the temperature regulating plate is connected to the side of the individual battery cell, and the temperature regulating plate is used to cool or heat the individual battery cell.

[0016] A battery pack according to a second aspect of the present invention includes:

[0017] The housing includes multiple plates that collectively define a storage cavity. Each plate has multiple cooling cavities and at least one receiving cavity inside. The cooling cavities and the receiving cavity are separated from each other along the height direction of the plate, and two cooling cavities are respectively provided on both sides of one receiving cavity. The cooling cavities are used to store a cooling medium, and the plate is also provided with a first opening communicating with the receiving cavity.

[0018] A single battery cell is connected to the housing and disposed in the storage cavity. The single battery cell has an explosion-proof valve, which is disposed opposite to the first opening. The explosion-proof valve is configured such that when the pressure inside the single battery cell reaches a set value, the explosion-proof valve opens, and the material ejected from the inside of the single battery cell through the explosion-proof valve enters the receiving cavity through the first opening. The cooling medium can cool the material in the receiving cavity.

[0019] The battery pack according to embodiments of the present invention has at least the following beneficial effects: multiple plates together form a storage cavity capable of housing a single battery cell. Furthermore, each plate has multiple cooling cavities and at least one receiving cavity. The cooling cavity stores a cooling medium to dissipate heat from the single battery cell. When a single battery cell experiences thermal runaway due to overheating, the internal pressure of the single battery cell reaches the set value of the explosion-proof valve, causing the explosion-proof valve to open. Substances ejected from the inside of the single battery cell through the explosion-proof valve enter the receiving cavity through a first opening, and the cooling medium cools the substances in the receiving cavity. Thus, substances from the thermal runaway of the single battery cell, such as gas and electrolyte, enter the receiving cavity. In the prior art, when a single battery cell experiences thermal runaway, the opening of the explosion-proof valve causes gas and electrolyte to spread to adjacent single batteries, affecting their performance and potentially causing danger. However, in the present application, when a single battery cell experiences thermal runaway, the opening of the explosion-proof valve allows substances from the single battery cell to enter the receiving cavity. The cooling medium in the cooling cavity further cools the receiving cavity, and because the substances from the single battery cell enter the receiving cavity, they do not affect or spread to adjacent single batteries. Specifically, the battery pack with individual cells can effectively cool the material ejected from the individual cells from the explosion-proof valve and prevent the spread of thermal runaway. Furthermore, since the receiving cavity and cooling cavity are separated along the height of the plate, and two cooling cavities are respectively provided on both sides of each receiving cavity, the receiving cavity can be located in the middle of the plate height direction or at the end of the plate height direction. Thus, the first opening of the receiving cavity can correspond to various types of individual cells, giving the battery pack high adaptability. In essence, the battery pack not only effectively cools the material ejected from the individual cells from the explosion-proof valve and prevents the spread of thermal runaway, but also possesses high adaptability.

[0020] According to some embodiments of the battery pack of the present invention, the plate is further provided with an exhaust port communicating with the receiving cavity, the exhaust port being located on the side surface of the housing opposite to the storage cavity.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 This is a schematic diagram of a battery pack according to some embodiments of the present invention;

[0024] Figure 2 This is an exploded schematic diagram of a battery pack according to some embodiments of the present invention;

[0025] Figure 3This is a partial schematic diagram of a battery pack according to some embodiments of the present invention;

[0026] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0027] Figure 5 This is a schematic diagram of the liquid cooling plate in the battery pack according to the first embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the liquid cooling plate in the battery pack according to the second embodiment of the present invention;

[0029] Figure 7 This is a plan view of the second partition of the liquid cooling plate in the battery pack according to the first embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of a single battery cell in the battery pack according to the first embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of a single battery cell in the battery pack according to the second embodiment of the present invention.

[0032] Figure 10 This is a schematic diagram of a seal in a battery pack according to some embodiments of the present invention.

[0033] Figure label:

[0034] Battery pack 10, housing 100, storage chamber 110, exhaust channel 120, main body 130, crossbeam 140, liquid cooling plate 200, cooling chamber 210, receiving chamber 220, opening group 230, first opening 240, second opening 250, first partition 260, second partition 270, weak area 280, surrounding area 290, single cell 300, explosion-proof valve 310, sealing element 400, third opening 410, exhaust valve 500. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0037] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0038] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0039] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] Please refer to Figure 1 In some embodiments, the battery pack 10 includes a liquid cooling plate 200 and individual battery cells 300. The liquid cooling plate 200 has multiple cooling chambers 210 and at least one receiving chamber 220. Along the width direction of the liquid cooling plate 200, the receiving chambers 220 and the cooling chambers 210 are separated from each other, and two cooling chambers 210 are respectively provided on both sides of each receiving chamber 220. The liquid cooling plate 200 also has a first opening 240 communicating with the receiving chamber 220. The cooling chamber 210 is used to contain a cooling medium, which can cool the material within the receiving chamber 220. When the liquid cooling plate 200 is in contact with the individual battery cell 300, the cooling medium can dissipate heat from the individual battery cell 300, preventing the individual battery cell 300 from overheating. Furthermore, since the individual battery cell 300 is connected to the liquid cooling plate 200, the cooling chambers 210 can also cool the receiving chamber 220.

[0041] Please refer to Figure 8The single-cell battery 300 has an explosion-proof valve 310. When the internal pressure of the battery is too high, the explosion-proof valve 310 automatically opens to directly discharge the high-pressure gas inside, thereby achieving the purpose of explosion prevention. The structure of the explosion-proof valve 310 is existing technology and will not be described in detail here. The explosion-proof valve 310 is arranged opposite to the first opening 240. Specifically, the opening of the explosion-proof valve 310 is arranged opposite to the first opening 240, so that when the material inside the single-cell battery 300 is ejected from the opening of the explosion-proof valve 310, the material inside the single-cell battery 300 can enter the receiving cavity 220 through the first opening 240.

[0042] The explosion-proof valve 310 is configured such that when the pressure inside the individual battery 300 reaches a set value, the explosion-proof valve 310 opens, and the substance ejected from the inside of the individual battery 300 through the explosion-proof valve 310 enters the receiving cavity 220 through the first opening 240. For details, please refer to... Figure 4 , Figure 4The middle arrow illustrates the flow path of substances within the single-cell battery 300 during thermal runaway. The liquid cooling plate 200 has a mutually separated cooling chamber 210 and a receiving chamber 220. The cooling chamber 210 stores the cooling medium, thereby dissipating heat from the single-cell battery 300. When the single-cell battery 300 experiences thermal runaway due to overheating, the internal pressure reaches the set value of the explosion-proof valve 310, causing it to open. Substances ejected from the inside of the single-cell battery 300 through the explosion-proof valve 310 enter the receiving chamber 220 through the first opening 240. Thus, substances from the thermal runaway of the single-cell battery 300, such as gas and electrolyte, enter the receiving chamber 220. In the prior art, when the single-cell battery 300 experiences thermal runaway, the opening of the explosion-proof valve 310 causes gas and electrolyte to spread to adjacent single-cell batteries 300, affecting their performance and potentially causing danger. In the event of thermal runaway of the single cell 300 of this application, the explosion-proof valve 310 opens, allowing the material inside the single cell 300 to enter the receiving cavity 220. The cooling medium in the cooling cavity 210 can also cool the receiving cavity 220. Since the material inside the single cell 300 enters the receiving cavity 220, it will not affect or spread to adjacent single cells 300. Specifically, the battery pack 10 with single cells 300 can effectively cool the material ejected from the explosion-proof valve of the single cell 300 and prevent the spread of thermal runaway. Furthermore, since the receiving cavity 220 and the cooling cavity 210 are separated from each other along the width direction of the liquid cooling plate 200, and two cooling cavities 210 are respectively provided on both sides of one receiving cavity 220, the receiving cavity 220 can be located in the middle of the width direction of the liquid cooling plate 200, or the receiving cavity 220 can be located at the end of the width direction of the liquid cooling plate 200. Thus, the first opening 240 of the receiving cavity 220 can correspond to various types of single cells 300, thereby giving the battery pack 10 high adaptability. Specifically, the battery pack 10 can not only effectively cool the material ejected from the single cell 300 from the explosion-proof valve 310 and prevent the spread of thermal runaway, but also has high adaptability.

[0043] Please refer to Figure 8 and Figure 9 The following describes several different types of single-cell batteries 300. Among them, the explosion-proof valve 310 is generally located on the top cover. In one type of single-cell battery 300, the explosion-proof valve 310 is located in the middle of the top cover. In this case, a receiving cavity 220 can be provided in the middle of the liquid cooling plate 200 to correspond with the explosion-proof valve 310. In another type of single-cell battery 300, the explosion-proof valve 310 is located at both ends of the top cover. In this case, receiving cavities 220 can be provided at both ends of the liquid cooling plate 200 to correspond with the explosion-proof valve 310. Please refer to... Figure 5 and Figure 6The liquid cooling plate 200 can have two cooling chambers 210 and one receiving chamber 220, with the two cooling chambers 210 located at the upper and lower ends of the receiving chamber 220, respectively. That is, the receiving chamber 220 is located in the middle vertically. Alternatively, the liquid cooling plate 200 can have one cooling chamber 210 and one receiving chamber 220, with the cooling chamber 210 located on one side of the receiving chamber 220. For example, the receiving chamber 220 may be on the left and the cooling chamber 210 on the right. Or, the receiving chamber 220 may be on the right and the cooling chamber 210 on the left. These varied positions of the cooling chambers 210 and the receiving chamber 220 allow the liquid cooling plate 200 to be more adaptable to the arrangement of individual battery cells 300 within the storage chamber 110 of the battery pack 10. For details, please refer to... Figure 6 , Figure 8 and Figure 9 It can be seen that the explosion-proof valve 310 of different types of single cells 300 can correspond to the first opening 240 of the receiving cavity 220 of the liquid cooling plate 200. Therefore, the battery pack 10 of this application can be adapted to different types of single cells 300.

[0044] As mentioned above, the inclusion of a receiving cavity 220 in the liquid cooling plate 200 prevents the spread of material from a single cell 300 to adjacent cells 300 during thermal runaway. Specifically, when a large amount of material is ejected from a single cell 300 during thermal runaway, it can be discharged outside the battery pack 10, i.e., into the external environment, thereby reducing the impact on the battery pack 10 and improving safety performance. Therefore, please refer to... Figure 3 and Figure 4 , Figure 4 The middle arrow indicates the flow path of substances in the single cell 300 during thermal runaway. In some embodiments, the battery pack 10 further includes a housing 100 having a storage cavity 110, in which the liquid cooling plate 200 and the single cell 300 are disposed. The housing 100 also has an exhaust channel 120 and an exhaust port (see exhaust channel 120 for details). Figure 1 , Figure 1The dashed line indicates the exhaust channel 120. The liquid cooling plate 200 is also provided with a second opening 250 that communicates with the receiving cavity 220. The second opening 250 is connected to the exhaust channel 120, and the exhaust port is located on the side surface of the housing 100 opposite to the storage cavity 110. The exhaust channel 120 communicates with the outside through the exhaust port. The following describes in detail the flow path of the substances inside the single cell 300 when the single cell 300 experiences thermal runaway. First, when the single cell 300 experiences thermal runaway due to excessive temperature, the pressure inside the single cell 300 will gradually increase, reaching the set value of the explosion-proof valve 310. At this time, the explosion-proof valve 310 opens, and substances inside the single cell 300, such as gas and electrolyte, will be ejected from the opening of the explosion-proof valve 310 and then enter the receiving cavity 220 through the first opening 240. After entering the receiving cavity 220, since the receiving cavity 220 is connected to the second opening 250, the material inside the single cell 300 will pass through the second opening 250 and enter the exhaust channel 120. Finally, it will be discharged to the outside through the exhaust channel 120.

[0045] Please refer to Figure 1 In some embodiments, an exhaust valve 500 is provided at the exhaust port of the exhaust passage 120. The exhaust valve 500 can discharge the gas in the material of the single cell 300, while preventing the electrolyte from being discharged into the outside world and polluting the environment. Alternatively, when the battery pack 10 is installed in a car, it can prevent the electrolyte from damaging the car. Furthermore, the exhaust valve 500 can be replaced with a pressure relief valve. The exhaust valve 500 can completely discharge the gas in the receiving cavity 220, while the pressure relief valve can release the gas in the receiving cavity 220 when the pressure exceeds the required level.

[0046] In some embodiments, the single-cell battery 300 further includes terminals, wherein the terminals may be disposed on one side of the single-cell battery 300, and the explosion-proof valve 310 may be disposed on the side of the single-cell battery 300 opposite to the terminals. Alternatively, the terminals and the explosion-proof valve 310 may be disposed on the same side of the single-cell battery 300. This arrangement allows the single-cell battery 300 to have high adaptability.

[0047] Furthermore, it can be understood that the greater the strength of the battery pack 10, the less impact it will suffer when encountering collisions, impacts, and drops. Therefore, due to its higher structural strength, the battery pack 10 can protect the individual battery cells 300 within it, and the battery pack 10 is less prone to deformation. Thus, the structural strength of the battery pack 10 can be improved by incorporating a crossbeam 140. For details, please refer to... Figure 3 In some embodiments, the housing 100 includes a main body 130 and a crossbeam 140. The main body 130 has a storage cavity 110, and the crossbeam 140 is connected to the cavity wall of the storage cavity 110. The crossbeam 140 is connected to the main body 130, thereby strengthening the structural strength of the main body 130 and giving the housing 100 of the battery pack 10 higher strength.

[0048] In some embodiments, the main body 130 and the crossbeam 140 are an integral structure. The housing 100 is manufactured using an integral molding process, which is efficient, strong, and meets the usage requirements of the battery pack 10.

[0049] Please refer to Figure 3 In some embodiments, the two ends of the liquid cooling plate 200 are respectively connected to the cavity wall of the storage chamber 110. Specifically, the two ends of the liquid cooling plate 200 can be welded to the cavity wall of the storage chamber 110. The liquid cooling plate 200 can serve as a crossbeam 140 of the housing 100, strengthening the structural strength of the housing 100. The liquid cooling plate 200 can also dissipate heat from the individual battery cells 300. Compared with the prior art where the housing 100 inside the battery pack 10 is equipped with a liquid cooling plate 200, this embodiment saves the space occupied by the liquid cooling plate 200 in the battery pack 10. In this way, the integration and space utilization of the battery pack 10 can be improved, allowing more individual battery cells 300 to be placed in the storage chamber 110, thereby increasing the energy density of the battery pack 10.

[0050] The aforementioned liquid cooling plate 200 can serve as a crossbeam 140, improving the structural strength of the housing 100. The following describes the case where the battery pack 10 includes multiple individual cells 300 and multiple liquid cooling plates 200. Please refer to... Figure 2 and Figure 5 In some embodiments, a single battery cell 300 is connected to a liquid cooling plate 200. Multiple single batteries cell 300 and liquid cooling plates 200 are provided. Each liquid cooling plate 200 has a row of single batteries cell 300 on each side. The liquid cooling plate 200 has multiple first openings 240. The explosion-proof valve 310 of each single battery cell 300 is positioned opposite one of the first openings 240. A row of single batteries cell 300 includes multiple single batteries cell 300. The following example illustrates four single batteries cell 300 on each side of a liquid cooling plate 200. That is, a row of single batteries cell 300 includes four single batteries cell 300. The liquid cooling plate 200 has multiple opening groups 230, each including two first openings 240 respectively located on each side of the receiving cavity 220. Please refer to... Figure 2 There can be eight individual cells 300, with four individual cells 300 located on the left side of the liquid cooling plate 200 and four individual cells 300 located on the right side of the liquid cooling plate 200. The liquid cooling plate 200 is provided with four opening groups 230 (the positions of the opening groups 230 can be found in the reference section). Figure 5Two first openings 240 of an opening group 230 are located on both sides of the liquid cooling plate 200. Specifically, the four first openings 240 on the left side of the liquid cooling plate 200 correspond to the explosion-proof valves 310 of four individual cells 300, and the four first openings 240 on the right side of the liquid cooling plate 200 correspond to the explosion-proof valves 310 of four individual cells 300. Thus, by providing multiple opening groups 230 on the liquid cooling plate 200, when the explosion-proof valve 310 of one of the individual cells 300 is opened, the material inside the individual cell 300 enters the receiving cavity 220 without affecting adjacent individual cells 300. Furthermore, a single liquid cooling plate 200 can not only dissipate heat from eight individual cells 300 simultaneously, but also prevent thermal runaway from spreading to surrounding individual cells 300 in the event of thermal runaway from one individual cell 300.

[0051] Furthermore, when a row of individual cells 300 is arranged on each side of the liquid cooling plate 200, if the individual cell 300 on the left experiences thermal runaway and its internal material is ejected, this material may spray onto the individual cells 300 on the opposite side. In other words, the material inside the individual cell 300 on the left may be sprayed onto the individual cell 300 on the right. Therefore, please refer to... Figure 5 In some embodiments, the liquid cooling plate 200 includes a first partition 260 that divides the receiving cavity 220 into two independent sub-receiving cavities. A first opening 240 is located on the side of the sub-receiving cavity opposite to the first partition 260. Thus, if a single-cell battery 300 located on one side of the liquid cooling plate 200 experiences thermal runaway, the material inside it will not be sprayed onto the single-cell battery 300 on the opposite side.

[0052] The following describes the arrangement of multiple individual cells 300 within the storage cavity 110. Please refer to... Figure 5 In some embodiments, multiple individual battery cells 300 are arranged along the length of the liquid cooling plate 200, and multiple opening groups 230 are spaced apart. In this embodiment, the individual battery cells 300 can be placed horizontally in the storage cavity 110.

[0053] In some embodiments, a plurality of individual battery cells 300 are arranged along the width direction of the liquid cooling plate 200, and a plurality of opening groups 230 are spaced apart. In this embodiment, the individual battery cells 300 can be placed vertically in the storage cavity 110.

[0054] Furthermore, to ensure that in the event of thermal runaway of the individual battery 300, when the material inside the individual battery 300 enters the first opening 240 through the explosion-proof valve 310, the material inside the individual battery 300 will not overflow to the outside of the individual battery 300, but will instead enter the receiving cavity 220, a seal 400 can be provided between the individual battery 300 and the liquid cooling plate 200. For details, please refer to... Figure 10In some embodiments, the battery pack 10 further includes a seal 400 having a third opening 410. The two sides of the seal 400 are connected to the individual battery cell 300 and the liquid cooling plate 200, respectively. The first opening 240 and the explosion-proof valve 310 are both positioned opposite to the third opening 410. The seal 400 can be made of high-temperature resistant rubber. The presence of the seal 400 around the explosion-proof valve 310 further ensures that the material inside the individual battery cell 300 enters the receiving cavity 220.

[0055] Please refer to Figure 7 In some embodiments, the liquid cooling plate 200 includes a second partition 270, with a receiving cavity 200 and a cooling cavity 210 respectively disposed on both sides of the second partition 270. The second partition 270 includes a weak region 280 and a surrounding region 290, with the surrounding region 290 connected to the periphery of the weak region 280. The thickness of the weak region 280 is less than the thickness of the surrounding region 290. A flow channel is provided within the cooling cavity 210, and the cooling medium can be water, which can flow or remain still within the flow channel. The liquid cooling plate 200 can be made of metal. The liquid cooling plate 200 has a cooling cavity 210 and a receiving cavity 220, separated by the second partition 270. The structure of the second partition 270 can be a mechanical structure of varying thickness; for example, the second partition 270 includes a weak region 280 and a surrounding region 290, with the thickness of the weak region 280 being less than the thickness of the surrounding region 290. Thus, under high pressure and high temperature, the weak area 280 experiences significant pressure. When the weak area 280 can no longer withstand the pressure, the material inside the single cell 300 will break through the weak area 280 and enter the cooling chamber 210 from the receiving cavity 220. When the weak area 280 ruptures, a large amount of fluid inside the cooling chamber 210 will flow out, cooling the emissions from the single cell 300 and greatly improving the cooling effect. Furthermore, the weak area 280 can also be formed of brittle materials, which are easily subjected to pressure and thus rupture.

[0056] In this configuration, when the individual battery 300 has not experienced thermal runaway, its temperature can be managed by a temperature regulating plate when it is very high or very low. Specifically, in some embodiments, the battery pack 10 also includes a temperature regulating plate. An explosion-proof valve 310 is located at one end of the individual battery 300, for example, at the top or bottom. The temperature regulating plate is connected to the side of the individual battery 300, for example, to the large or small surface. The temperature regulating plate is used to cool or heat the individual battery 300. Specifically, hot water can be placed inside the temperature regulating plate so that it can heat the individual battery 300 when its temperature is low. Cold water can be placed inside the temperature regulating plate so that it can dissipate heat from the individual battery 300 when its temperature is high.

[0057] In some embodiments, to improve the effectiveness of the temperature regulating plate in managing the temperature of the individual battery 300, a circulating medium can be used to flow within the channels of the temperature regulating plate. Specifically, the temperature regulating plate is connected to the outside environment, allowing hot or cold water to flow within the channels of the temperature regulating plate. The flowing hot water can continuously heat the individual battery 300, while the flowing cold water can continuously dissipate heat from the individual battery 300.

[0058] Please refer to Figure 3In some embodiments, the battery pack 10 includes a housing 100 and individual battery cells 300. The housing 100 includes multiple plates that collectively define a storage cavity 110. For example, four plates surround the sidewalls forming the storage cavity 110, and two plates surround the top and bottom walls forming the storage cavity 110. Each plate has multiple cooling chambers 210 and at least one receiving cavity 220. The cooling chambers 210 and the receiving cavity 220 are separated from each other along the height of the plate, and two cooling chambers 210 are respectively provided on both sides of each receiving cavity 220. The cooling chambers 210 are used to store a cooling medium, and the plate also has a first opening 240 communicating with the receiving cavity 220. The individual battery cells 300 are connected to the housing 100 and disposed in the storage cavity 110. Each individual battery cell 300 has an explosion-proof valve 310, which is disposed opposite to the first opening 240. The explosion-proof valve 310 is configured such that when the pressure inside the single cell 300 reaches a set value, the explosion-proof valve 310 opens, and the substance ejected from the inside of the single cell 300 through the explosion-proof valve 310 enters the receiving cavity 220 through the first opening 240. The cooling medium can cool the substance in the receiving cavity 220. Specifically, multiple plates together form a storage cavity 110 for placing the single cell 300. In addition, the plates have mutually separated cooling cavities 210 and receiving cavities 220. The cooling cavity 210 is used to store the cooling medium, thereby dissipating heat from the single cell 300. When the single cell 300 experiences thermal runaway due to overheating, the pressure inside the single cell 300 reaches the set value of the explosion-proof valve 310, and the explosion-proof valve 310 opens. The substance ejected from the inside of the single cell 300 through the explosion-proof valve 310 enters the receiving cavity 220 through the first opening 240. In this way, substances such as gas and electrolyte that cause thermal runaway of the single cell 300 will enter the receiving cavity 220. In the prior art, when a single cell 300 experiences thermal runaway, the explosion-proof valve 310 opens, causing gas and electrolyte to spread to adjacent single cells 300, thus affecting their performance and potentially causing danger. However, in this application, when a single cell 300 experiences thermal runaway, the explosion-proof valve 310 opens, allowing the material inside the single cell 300 to enter the receiving cavity 220. The cooling medium in the cooling cavity 210 can also cool the receiving cavity 220. Furthermore, because the material inside the single cell 300 enters the receiving cavity 220, it will not affect or spread to adjacent single cells 300. Specifically, the battery pack 10 with single cells 300 can effectively cool the material ejected from the explosion-proof valve of the single cell 300 and prevent the spread of thermal runaway. Further, the receiving cavity 220 and the cooling cavity 210 are separated along the height of the plate, and two cooling cavities 210 are respectively provided on both sides of one receiving cavity 220. Therefore, the receiving cavity 220 can be located at the middle position in the plate height direction, or the receiving cavity 220 can be located at the end position in the plate height direction.Thus, the first opening 240 of the receiving cavity 220 can correspond to various types of single cells 300, thereby giving the battery pack 10 high adaptability. Specifically, the battery pack 10 can not only effectively cool the material ejected from the single cell 300 from the explosion-proof valve 310 and prevent the spread of thermal runaway, but also has high adaptability.

[0059] Furthermore, in the above embodiment, because a cooling chamber 210 is provided inside the plate, the casing 100 of the battery pack 10 also serves to cool the individual battery cells 300. Thus, in this embodiment, the battery pack 10 does not require an additional liquid cooling plate 200, thereby saving more time for placing the individual battery cells 300 and improving the energy density of the battery pack 10.

[0060] In addition, the manner in which the plate has multiple cooling chambers 210 and at least one receiving chamber 220 can be referred to Figure 5 and Figure 6 The structure of the liquid cooling plate 200. In the above embodiment, the plate can serve as the liquid cooling plate 200.

[0061] In some embodiments, the plate is further provided with an exhaust port communicating with the receiving cavity 220, the exhaust port being located on the side surface of the housing 100 opposite to the storage cavity 110. The receiving cavity 200 is connected to the outside through the exhaust port to discharge the material inside the single cell 300 to the outside. The flow path of the material inside the single cell 300 when the single cell 300 experiences thermal runaway is described in detail below. First, when the single cell 300 experiences thermal runaway due to excessive temperature, the pressure inside the single cell 300 will gradually increase, reaching the set value of the explosion-proof valve 310. At this time, the explosion-proof valve 310 opens, and the material inside the single cell 300, such as gas and electrolyte, will be ejected from the opening of the explosion-proof valve 310, and then enter the receiving cavity 220 through the first opening 240. After entering the receiving cavity 220, since the receiving cavity 220 is connected to the exhaust port, the material inside the single cell 300 will pass through the exhaust port and be discharged to the outside.

[0062] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A battery pack, characterized in that, include: A liquid cooling plate has multiple cooling chambers and at least one receiving chamber. The receiving chamber and the cooling chamber are separated from each other along the width direction of the liquid cooling plate, and two cooling chambers are respectively provided on both sides of one receiving chamber. The cooling chamber is used to contain a cooling medium, and the liquid cooling plate is also provided with a first opening communicating with the receiving chamber. A single battery cell, wherein the single battery cell has an explosion-proof valve, the explosion-proof valve being disposed opposite to the first opening, the explosion-proof valve being configured such that: when the pressure inside the single battery cell reaches a set value, the explosion-proof valve opens, and material ejected from the inside of the single battery cell through the explosion-proof valve enters the receiving cavity through the first opening; the cooling medium is capable of cooling the material in the receiving cavity; The individual battery is connected to the liquid cooling plate. Multiple individual batteries and liquid cooling plates are provided. A row of individual batteries is provided on both sides of each liquid cooling plate. The liquid cooling plate is provided with multiple first openings. The explosion-proof valve of each individual battery is provided opposite to one of the first openings. The liquid cooling plate includes a first partition, which divides the receiving cavity into two independent sub-receiving cavities. The first opening is located on the side of the sub-receiving cavity opposite to the first partition. The liquid cooling plate includes a second partition, and the receiving cavity and the cooling cavity are respectively disposed on both sides of the second partition. The second partition includes a weak area and a surrounding area, and the surrounding area is connected to the periphery of the weak area. The thickness of the weak area is less than the thickness of the surrounding area.

2. The battery pack according to claim 1, characterized in that, The battery pack also includes a housing, which has a storage cavity, in which the liquid cooling plate and the individual battery cells are disposed; the housing also has an exhaust channel and an exhaust port that are interconnected, and the liquid cooling plate is also provided with a second opening that communicates with the housing cavity, the second opening and the exhaust channel are connected, and the exhaust port is located on the side surface of the housing that is opposite to the storage cavity.

3. The battery pack according to claim 2, characterized in that, The two ends of the liquid cooling plate are respectively connected to the cavity wall of the storage cavity.

4. The battery pack according to claim 1, characterized in that, The battery pack also includes a sealing element with a third opening. The two sides of the sealing element are respectively connected to the individual battery and the liquid cooling plate. The first opening and the explosion-proof valve are both arranged opposite to the third opening.

5. The battery pack according to claim 1, characterized in that, The battery pack also includes a temperature regulating plate. The explosion-proof valve is located at one end of the individual battery cell. The temperature regulating plate is connected to the side of the individual battery cell and is used to cool or heat the individual battery cell.

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