Cell group, battery, and electric device

Abstract

A cell group (1), a battery (100), and an electric device. The cell group (1) comprises a housing (11) and pouch cells. The housing (11) is provided with an accommodating cavity and pressure relief holes (1a) communicated with the accommodating cavity. The housing (11) comprises an end cover (112). The end cover (112) comprises a pressure relief area (1121) and a cell connection area (1122). The pressure relief holes (1a) are formed in the pressure relief area (1121). The cell connection area (1122) is configured to be electrically connected to the pouch cells. At least two pouch cells are accommodated in the accommodating cavity. The battery (100) comprises a case (101), balancing valves (102) and the cell group (1). The case (101) is provided with a placement cavity (100a). The balancing valves (102) are arranged on the case (101). The cell group (1) is located in the placement cavity (100a) of the case (101). The electric device comprises the battery (100) for providing electrical energy. Heat and gas generated during thermal runaway of the pouch cells of the cell group (1) can be directionally ejected out from the pressure relief holes (1a) to avoid uncontrolled ejections, thereby improving the safety of the pouch cells during thermal runaway.

Description

A battery cell pack, a battery, and an electrical device.

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202420865125.X, filed on April 24, 2024, entitled “A Battery Cell Pack, Battery and Electrical Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery technology, and more particularly to a battery cell pack, a battery, and an electrical device. Background Technology

[0004] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0005] Pouch cells are widely used in various fields, such as vehicles, aircraft, and energy storage devices, where they provide power. However, under certain triggering factors, pouch cells may experience thermal runaway. In related technologies, pouch cells cannot achieve directional ejection during thermal runaway, affecting safety.

[0006] Summary of the Invention

[0007] In view of this, the present disclosure aims to provide a battery cell pack, a battery, and an electrical device to improve the safety of a pouch battery cell in the event of thermal runaway.

[0008] This disclosure provides a battery cell pack, including:

[0009] The housing has a cavity and a pressure relief hole communicating with the cavity; the housing includes an end cap, the end cap including a pressure relief area and a power connection area, the pressure relief area having the pressure relief hole.

[0010] A pouch cell, at least two of which are housed within the cavity, and the contact area is used for electrical connection with the pouch cell.

[0011] This disclosure provides a battery cell assembly where, during thermal runaway of a single pouch cell, the heat and gas generated can be directed out through a pressure relief hole, preventing indiscriminate ejection and thus improving safety during thermal runaway. Furthermore, the pressure relief area is separated from the charging area, allowing the gas to escape from the pressure relief area during thermal runaway without significantly affecting the charging area, further enhancing safety.

[0012] In some embodiments, the housing includes a shell and an end cap, the shell having a hollow structure with a first opening at a first end, the end cap closing the first opening, and the pressure relief hole being formed in the end cap.

[0013] In this embodiment, when a single pouch battery cell experiences thermal runaway, heat can be directionally ejected from the end cap of the casing, improving the safety of the pouch battery cell during thermal runaway.

[0014] In some embodiments, the housing has a second opening at a second end away from the first opening, and the housing includes a blocking member that seals and closes the second opening.

[0015] In this embodiment, the housing, end cap, and blocking member can be connected in sequence to form a cavity, making it easier to accommodate the soft-pack battery cells in the cavity and reducing the assembly difficulty of the battery cell pack.

[0016] In some embodiments, the battery cell pack includes a sealing strip that surrounds the housing to seal the gap between the end cap and the housing.

[0017] In this embodiment, on the one hand, the sealing strip can improve the sealing performance at the junction of the end cap and the housing, preventing heat from being ejected from the junction of the end cap and the housing during thermal runaway of the pouch battery cell; on the other hand, it can also enhance the connection stability between the end cap and the housing. In some embodiments, the battery cell assembly includes a protective component that shields the pressure relief hole.

[0018] In this embodiment, when the protective component covers the pressure relief hole, the protective component can provide a certain degree of protection for the pressure relief hole, preventing dust and other particles from entering the cavity.

[0019] In some embodiments, the protective element includes an opening / closing portion that can openably and close to shield the pressure relief port.

[0020] When a single pouch battery cell experiences thermal runaway, the opening and closing part of the protective component can prevent the pressure relief hole from being blocked and thus avoid obstructing the directional ejection of heat from the pressure relief hole. In addition, the opening and closing part can also be opened manually.

[0021] This disclosure also provides a battery, comprising:

[0022] The box body has a placement cavity;

[0023] A balancing valve is installed on the housing;

[0024] The battery cell pack described in any of the above embodiments is located within the placement cavity of the housing.

[0025] The battery provided in this disclosure includes the battery cell assembly of this disclosure, which has the same beneficial effects as the battery cell assembly. At the same time, when the soft-pack battery cell in the battery cell assembly experiences thermal runaway, the heat and airflow can be directionally ejected from the pressure relief hole of the battery assembly and then directionally ejected to the outside of the housing through the balance valve on the housing.

[0026] In some embodiments, at least two of the battery cell groups are arranged in parallel to form a battery cell, and the pressure relief holes of each of the battery cell groups of the battery cell are oriented in the same direction.

[0027] In this embodiment, when the pouch cells in each battery cell group of the same battery unit experience thermal runaway, the heat can be ejected from the same direction, reducing the impact of each battery cell group on the other battery cell groups in the battery unit during thermal runaway.

[0028] In some embodiments, the pressure relief holes of the two battery cells face opposite directions to form a module.

[0029] In this embodiment, in the module, the thermal runaway eruption direction of any group of battery cells in one battery cell is opposite to the thermal runaway eruption direction of any group of battery cells in another battery cell, which can avoid the two battery cells in the module from affecting each other.

[0030] In some embodiments, the pressure relief port faces the balance valve.

[0031] In this embodiment, after the thermal runaway of a single pouch battery cell, the path of the emitted heat through the pressure relief hole to the balance valve is shorter, which is more conducive to the directional and rapid emission of the heat after the thermal runaway of the single pouch battery cell to the outside of the box.

[0032] In some embodiments, the balancing valve is disposed on the circumferential surface of the housing.

[0033] In this embodiment, the heat and airflow from the balancing valve can be ejected in a circumferential direction, rather than in a vertical direction.

[0034] This disclosure also provides an electrical device, including a battery as described in any of the above embodiments for providing electrical energy.

[0035] The electrical device provided in this disclosure includes the battery of this disclosure and has the same beneficial effects as the battery. Attached Figure Description

[0036] Figure 1 is a schematic diagram of a battery cell pack from one perspective according to some embodiments of the present disclosure;

[0037] Figure 2 is a schematic diagram of the battery cell assembly in Figure 1 from another perspective;

[0038] Figure 3 is a schematic diagram of the battery cell assembly in Figure 2 from another perspective;

[0039] Figure 4 is a schematic diagram of an end cap provided in some embodiments of this disclosure from one perspective;

[0040] Figure 5 is a schematic diagram of the end cap in Figure 4 from another perspective, in which the protective component covers the pressure relief hole;

[0041] Figure 6 is a schematic diagram of the end cap in Figure 4 from another perspective, in which the pressure relief hole is not covered by the protective component;

[0042] Figure 7 is a schematic diagram of the end cap in Figure 4 from another perspective;

[0043] Figure 8 is a partial schematic diagram of a battery from one perspective, provided in some embodiments of this disclosure;

[0044] Figure 9 is a partial schematic diagram of a battery from another perspective, provided in some embodiments of this disclosure.

[0045] Explanation of reference numerals in the attached drawings: 1. Battery cell assembly; 11. Outer casing; 1a. Pressure relief hole; 111. Housing; 112. End cap; 1121. Pressure relief area; 1122. Electrical connection area; 113. Blocking component; 12. Protective component; 100. Battery; 101. Box body; 102. Balance valve; 100a. Placement cavity. Detailed Implementation

[0046] The embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this disclosure.

[0047] The various specific technical features and embodiments described in the detailed implementation can be combined in any suitable manner without contradiction. For example, different implementation methods can be formed by combining different specific technical features / implementations. In order to avoid unnecessary repetition, the various possible combinations of the various specific technical features / implementations in this disclosure will not be described separately.

[0048] It should be noted that the terms "comprising," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. The present disclosure will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0049] It should be noted that in the embodiments of this disclosure, "at least two" includes two or more. "Multiple" includes two or more.

[0050] Under certain triggering factors, pouch cell may experience thermal runaway. In related technologies, pouch cell cannot achieve directional ejection during thermal runaway, which affects safety.

[0051] In order to improve the safety of pouch battery cells, this disclosure includes at least two pouch battery cells housed within a casing, and a pressure relief hole is provided on the casing so that the pouch battery cells can be ejected directionally from the pressure relief hole in the event of thermal runaway.

[0052] Referring to Figure 1, the battery cell assembly includes at least two pouch cell units housed within a casing. Exemplarily, the at least two pouch cell units in the battery cell assembly can be connected in series, parallel, or a combination thereof. A combination thereof means that at least two pouch cell units are connected in both series and parallel configurations. The at least two pouch cell units can be directly connected in series, parallel, or a combination thereof; alternatively, at least two pouch cell units can first be connected in series, parallel, or a combination thereof to form a pouch cell module, and then at least two pouch cell modules can be connected in series, parallel, or a combination thereof to form a single unit. The battery cell assembly may also include other structures; for example, it may include a busbar for electrical connection between the at least two pouch cell units.

[0053] The pouch cell disclosed herein is a battery cell with a flexible casing, unlike battery cells using a rigid casing. The flexible casing is made of a flexible material, and its hardness is less than that of a rigid casing. The material of the flexible casing is not limited; for example, it includes, but is not limited to, aluminum-plastic film. Electrode components and an electrolyte can be encapsulated within the flexible casing. The electrode components include a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between them while allowing active ions to pass through. During the charging and discharging process of the pouch cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes.

[0054] The soft-pack battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, or a lead-acid battery cell, etc., and the embodiments disclosed herein are not limited to this.

[0055] Please refer to Figures 8 and 9. The battery includes at least one battery cell assembly, which is placed in a housing.

[0056] The batteries disclosed herein can be used in electrical devices, including but not limited to energy storage devices, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. Energy storage devices include but are not limited to energy storage containers, energy storage cabinets, etc.

[0057] This disclosure provides a battery cell assembly 1, including a housing 11 and pouch battery cells. The housing 11 has a cavity and a pressure relief hole 1a communicating with the cavity. The housing 11 includes an end cap 112, which includes a pressure relief area 1121 and a power connection area 1122. The pressure relief area 1121 has the pressure relief hole 1a, and the power connection area 1122 is used for electrical connection with the pouch battery cells. At least two pouch battery cells are accommodated within the cavity. A pouch battery cell is a battery cell with a flexible shell as its encapsulation, which is different from a battery cell using a rigid shell as its encapsulation.

[0058] The battery cell pack 1 houses at least two pouch battery cells within the housing 11, and encapsulates at least two pouch battery cells into an independent module. When each pouch battery cell in the battery cell pack 1 experiences thermal runaway, it erupts through a pressure relief hole on the same housing.

[0059] The outer casing 11 is an encapsulation material that houses at least two pouch cell cells in the battery cell pack.

[0060] A cavity is a spatial structure formed by the outer casing that can be used to house components; at least two pouch cell units are housed within the cavity.

[0061] The pressure relief hole 1a is a through hole formed on the outer casing for heat flow.

[0062] The pressure relief zone 1121 is an area through which heat and airflow pass, located on the end cap 112.

[0063] The electrical connection area 1122 is an area outside the pressure relief area 1121 on the end cover 112, and is used for electrical connection.

[0064] Please refer to Figures 4 to 7. The end cap 112 includes a pressure relief area 1121 and a power connection area 1122. That is, the soft-pack battery cell is depressurized and connected to power through the end cap 112 of the outer casing 11.

[0065] The pressure relief area 1121 has a pressure relief hole 1a, that is, the pressure relief hole 1a is located within the pressure relief area 1121, and the soft-pack battery cell is depressurized through the pressure relief area 1121 of the end cover 112.

[0066] The contact area 1122 is used for electrical connection with the individual pouch battery cells. That is, the individual pouch battery cells are electrically connected to the outside world through the contact area 1122 on the end cover 112. Exemplarily, contact terminals and / or posts and / or connectors are provided in the contact area 1122. The battery cell assembly 1 provided in this embodiment has a housing 11 with a cavity and a pressure relief hole 1a communicating with the cavity. That is, the space inside the housing 11 can communicate with the atmosphere outside the housing 11 through the pressure relief hole 1a. The individual pouch battery cells are housed in the cavity, meaning that while the individual pouch battery cells are covered by the housing 11, they can exchange heat with the outside world through the pressure relief hole 1a on the housing 11. Thus, the heat and gas generated during thermal runaway of the individual pouch battery cells can be directionally ejected from the pressure relief hole 1a, preventing indiscriminate ejection and improving the safety of the individual pouch battery cells during thermal runaway. Furthermore, the pressure relief area 1121 is separated from the charging area 1122, allowing the pouch battery cell to erupt from the pressure relief area 1121 in the event of thermal runaway, minimizing impact on the charging area 1122, thus improving safety during thermal runaway. The cavity can contain one or more pouch battery cells; for example, the housing 11 can contain four. Exemplarily, the multiple pouch battery cells within the housing 11 can be connected in series, parallel, or a combination thereof. A combination thereof refers to multiple pouch battery cells being connected in both series and parallel. The cavity may contain other components besides the pouch battery cells.

[0067] In some embodiments, the outer casing 11 may be made of a rigid material. Exemplary examples include, but are not limited to, rigid metals such as aluminum and / or steel. The rigidity of the outer casing 11 may be greater than the rigidity of the flexible casing of the pouch battery cell. That is, the deformation force of the outer casing 11 is greater than the deformation force of the flexible casing. The rigid outer casing 11 has better structural strength, providing constraint for the pouch battery cell and strengthening its binding.

[0068] In some embodiments, the outer casing 11 is generally hexahedral in shape. A cavity is formed within the outer casing 11. Thus, the outer casing 11 constrains the degrees of freedom of the pouch cell in six directions, enhancing the ability to restrain the pouch cell. For example, any one of the six sidewalls of the outer casing 11 has a pressure relief hole 1a. Thus, the heat and gas generated during thermal runaway of the pouch cell can be directionally ejected in a single direction.

[0069] In some embodiments, the outer casing includes a housing 111 and an end cap 112. The housing 111 has a hollow structure with a first opening at one end, and the end cap 112 closes the first opening. A pressure relief hole 1a is formed in the end cap 112. That is, the pressure relief hole 1a is located in the region of the end cap 112, so that heat can be directionally ejected from the end cap 112 in the event of thermal runaway of a single pouch battery cell. This improves the safety of the pouch battery cell during thermal runaway.

[0070] The shell 111 is the main frame of the outer shell 11 and is the main structure that encloses and forms the cavity.

[0071] The end cap 112 is part of the outer shell 11 and can close the first opening formed by the shell 111, and together with the shell 111, it participates in enclosing the cavity.

[0072] The housing 111 has a hollow structure with an opening, and the end cap 112 closes the first opening. That is, the housing 111 and the end cap 112 can be manufactured separately. The housing 111 and the end cap 112 are arranged to form a cavity, which facilitates the manufacture and installation of the outer shell 11.

[0073] In some embodiments, the battery cell pack 1 includes an electrical terminal disposed on the end cap 112 of the housing 11, and the tabs of the pouch battery cells are electrically connected to the electrical terminal.

[0074] In some embodiments, the housing 111 has a second opening at a second end away from the first opening, and the housing 11 includes a stop 113 that seals the second opening of the housing 111.

[0075] The blocking member 113 is part of the housing 11, and the blocking member 113 and the housing 111 together form a cavity.

[0076] In other words, the blocking member 113 seals the second opening of the closed housing 111 to form a cavity with a second end seal.

[0077] In one embodiment, referring to Figures 1 to 3, the housing 111 may have openings at both ends, with the openings being a first opening at one end and a second opening at the other end. That is, the housing 111 may have openings at both ends, with the first opening at one end and the second opening at the other end facing opposite directions. The end cap 112 and the blocking member 113 respectively close the first and second openings, and the housing 111, end cap 112, and blocking member 113 together enclose a cavity. Thus, the housing 111, end cap 112, and blocking member 113 can be connected sequentially to enclose the cavity, making it easier to accommodate the pouch battery cell within the cavity. As an example, the pouch battery cell can be pushed into the interior space of the housing 111 from one of the first and second openings, and pulled out from the other opening, thereby reducing the assembly difficulty of the battery cell assembly 1.

[0078] In one embodiment, the openings at both ends of the housing 111 are located at the top and bottom, respectively. The end cap 112 can be located at the top of the housing 111, and the blocking member 113 can be located at the bottom of the housing 111. When the battery cell pack 1 is placed upright, the top and bottom directions are perpendicular to the horizontal plane, with the top facing the sky and the bottom facing the ground. When the battery cell pack 1 is placed on its side, the top and bottom directions are parallel to the horizontal plane, with the top and bottom facing opposite directions.

[0079] The material, shape, quantity, and connection method of the blocking member 113 to the housing 111 are not specifically limited. As an example, the blocking member 113 includes mica paper and sealant covering the mica paper. The mica paper can be pasted to the bottom side of the housing 111 with sealant to seal one end opening.

[0080] Both the end cap 112 and the housing 111 can be made of metal, and the end cap 112 and the housing 111 can be welded together. As an example, the peripheral side of the end cap 112 and the peripheral side of the housing 111 can be welded together, so that there is no gap between the end cap 112 and the housing 111, and the connection between the end cap 112 and the housing 111 will not leak air.

[0081] In some embodiments, the battery cell pack 1 includes a sealing strip that surrounds the housing 111 to seal the gap between the end cap 112 and the housing 111.

[0082] The sealing strip surrounds the circumference of the housing 111 to seal the gap between the end cap 112 and the housing 111. This improves the sealing performance at the junction of the end cap 112 and the housing 111, preventing heat from being ejected from the junction of the end cap 112 and the housing 111 in the event of thermal runaway of a single soft-pack battery cell. On the other hand, it also enhances the connection stability between the end cap 112 and the housing 111.

[0083] The material and width of the sealing tape are not limited, as long as it serves to seal the junction between the end cap 112 and the housing 111. For example, the sealing tape may be, but is not limited to, adhesive tape, and the material used may include, but is not limited to, polyethylene or polyvinyl chloride. As an example, the sealing tape may be made of an insulating composite material.

[0084] In some embodiments, the battery cell pack 1 includes a protective element 12 that shields the pressure relief hole 1a.

[0085] Protective component 12 is a component that can cover the pressure relief hole and can play a certain protective role.

[0086] When the protective component 12 covers the pressure relief hole 1a, the protective component 12 can provide a certain degree of protection for the pressure relief hole 1a, preventing dust and other particles from entering the cavity.

[0087] In some embodiments, the protective element 12 includes an opening and closing portion that can open and close to shield the pressure relief hole 1a.

[0088] The opening and closing part is part of the protective component 12. The opening and closing part can open and close to cover the pressure relief hole 1a. That is to say, the opening and closing part can cover the pressure relief hole 1a, and the opening and closing part can also release the cover of the pressure relief hole 1a under certain conditions. In this way, when the soft-pack battery cell undergoes thermal runaway, the opening and closing part can avoid covering the pressure relief hole 1a without hindering the directional ejection of heat from the pressure relief hole 1a.

[0089] In one embodiment, the airflow generated by the thermal runaway of a single pouch battery cell can be sprayed off the protective member 12 so that the opening and closing part does not obstruct the directional ejection of heat from the pressure relief hole 1a.

[0090] In one embodiment, the opening and closing part can be manually opened so that it does not block the pressure relief hole.

[0091] In one embodiment, when the opening and closing portion does not obstruct the pressure relief hole, the protective member 12 can remain connected to the end cap 112.

[0092] The method by which the protective component 12 covers the pressure relief hole 1a is not specifically limited; for example, it can be bonded.

[0093] The material of protective component 12 is not specifically limited; for example, protective component 12 can be mica paper.

[0094] The shape and size of the protective element 12 are not specifically limited, as long as it can be opened and closed to cover the pressure relief hole 1a. As an example, please refer to Figures 4 and 5. The protective element 12 is mica paper. The shape and size of the mica paper match the shape and size of the pressure relief area 1121. The mica paper is pasted on the pressure relief area 1121. When the soft-pack battery cell does not experience thermal runaway, the mica paper can play a dustproof role for the pressure relief hole 1a. When the soft-pack battery cell experiences thermal runaway, the mica paper can be sprayed off without obstructing the heat from being emitted from the pressure relief hole 1a.

[0095] This disclosure provides a battery 100, including a housing 101, a balance valve 102, and a battery cell assembly 1 as described in any embodiment of this disclosure. The housing 101 has a placement cavity 100a, the balance valve 102 is disposed on the housing 101, and the battery cell assembly 1 is located in the placement cavity 100a of the housing 101.

[0096] The housing 101 is a container structure that houses the battery cell pack 1 and other various components.

[0097] The balancing valve 102 is used to release heat and airflow from inside the housing 101 to outside the housing 101.

[0098] The placement cavity 100a is formed inside the box 101. It is a hollow space structure enclosed by the walls of the box 101 and can be used to accommodate components.

[0099] The battery cell pack 1 is located in the placement cavity 100a of the housing 101, and the balance valve 102 is installed on the housing 101. In this way, when the soft-pack battery cell in the battery cell pack 1 experiences thermal runaway, the heat and airflow can be directionally ejected from the pressure relief hole 1a of the battery cell pack 1 and then directionally ejected to the outside of the housing 101 through the balance valve 102 on the housing 101.

[0100] The balancing valve 102 includes, but is not limited to, explosion-proof valves or vent valves. The number and specific shape of the balancing valves 102 are not limited and can be configured according to actual conditions.

[0101] In some embodiments, at least two battery cell groups 1 are arranged in parallel to form a battery cell, and the pressure relief holes 1a of each battery cell group 1 of the battery cell have the same orientation.

[0102] In one embodiment, for example, the pressure relief vent 1a of each battery cell group 1 of the battery cell faces one of the following directions: left, right, front, rear, top, and bottom.

[0103] It should be noted that "down" refers to the direction facing the ground, "up" is the opposite direction, "front" and "back" are opposite directions, and "left" and "right" are opposite directions. The up and down, front and back, and left and right directions are perpendicular to each other and together form a three-dimensional vertical coordinate system.

[0104] At least two battery cells 1 are arranged in parallel to form a battery cell. That is, a battery cell can have multiple battery cells 1 arranged in parallel. In the battery cell, the sidewalls of the outer shell 11 of each battery cell 1 without pressure relief holes 1a are opposite each other.

[0105] At least two battery cells 1 are arranged in parallel to form a battery cell. The pressure relief holes 1a of each battery cell 1 in the same battery cell face the same direction. That is, the pressure relief holes 1a of each battery cell 1 in the same battery cell can be approximately in the same plane, and the pressure relief direction of each battery cell 1 in the same battery cell is the same. In this way, when the pouch cells in each battery cell 1 in the same battery cell experience thermal runaway, the heat can be ejected from the same direction, reducing the impact of each battery cell 1 on the other battery cell 1 in the battery cell during thermal runaway.

[0106] In one embodiment, the battery 100 includes a heat insulation pad, and the heat insulation pad is disposed between two adjacent battery cell groups 1. In this way, heat transfer between two adjacent battery cell groups 1 can be reduced, and the impact of thermal runaway of one battery cell group 1 on the adjacent battery cell group 1 can be reduced.

[0107] The connection method of each battery cell group 1 in the battery unit is not limited, for example, including but not limited to welding of end side plates, locking, and steel strip binding.

[0108] In some embodiments, the pressure relief holes 1a of the two battery cells face opposite directions to form a module.

[0109] The pressure relief holes 1a of the two battery cells face opposite directions to form a module, meaning that the pressure relief directions of the two battery cells within the module are opposite. Taking the pressure relief hole 1a located at the top of the housing 11 as an example, the pressure relief holes 1a of the two battery cells can face left and right respectively, and the bottoms of the housings 11 of the two battery cells face each other. It is understood that there can be a gap between the bottoms of the housings 11 of the two battery cells, and the bottoms of the housings 11 of the two battery cells can also contact each other.

[0110] As an example, see Figures 8 and 9, in the module, the pressure relief vents 1a of the two battery cells face left and right, respectively. In yet another example, in the module, the pressure relief vents 1a of the two battery cells face forward and rearward, respectively.

[0111] The pressure relief holes 1a of the two battery cells face opposite directions to form a module. In this way, in the module, the thermal runaway direction of any battery cell group 1 in one battery cell is opposite to the thermal runaway direction of any battery cell group 1 in the other battery cell, which can prevent the two battery cells in the module from affecting each other.

[0112] As an example, please refer to Figures 8 and 9. Multiple battery cell groups 1 are arranged in parallel to form a battery cell. The pressure relief holes 1a of two battery cells containing the same number of battery cell groups 1 face opposite directions, and the bottoms of the housings 11 of the two battery cells are opposite to each other.

[0113] In one embodiment, the bottoms of the housings 11 of the two battery cells of the module are connected. For example, the bottoms of the housings 11 of the two battery cells of the module can be bonded together with an adhesive.

[0114] In some embodiments, the pressure relief port 1a faces the balance valve 102. As an example, please refer to Figures 8 and 9. Balance valves 102 are formed on both side walls of the housing 101 along the left and right directions. For ease of description, the balance valve 102 on the left side wall of the housing 101 is the first balance valve 102, and the balance valve 102 on the right side wall of the housing 101 is the second balance valve 102. The pressure relief port 1a of one battery cell of the module faces the first balance valve 102, and the pressure relief port 1a of the other battery cell of the module faces the second balance valve 102.

[0115] When a pouch cell in battery cell group 1 experiences thermal runaway, the heat emitted from the pressure relief hole 1a can be released through the balance valve 102. Since the pressure relief hole 1a faces the balance valve 102, the path of the emitted heat from the pouch cell after thermal runaway is shorter, which is more conducive to the directional and rapid ejection of heat from the pouch cell after thermal runaway to the outside of the housing 101.

[0116] Multiple pressure relief ports 1a of a battery cell can face multiple balance valves 102. As an example, please refer to Figures 8 and 9. There are two first balance valves 102, and the multiple pressure relief ports 1a of one battery cell in the module can face two first balance valves 102. There are two second balance valves 102, and the multiple pressure relief ports 1a of another battery cell in the module can face two second balance valves 102.

[0117] In some embodiments, the balance valve 102 is disposed on the circumferential surface of the housing 101. It should be noted that the circumferential surface of the housing 101 is the surface surrounding the housing 101 along a straight line extending vertically. In this way, heat and airflow from the balance valve 102 can be ejected circumferentially, rather than vertically. Taking the battery 100 used in an aircraft as an example, the balance valve 102 being disposed on the circumferential surface of the housing 101 allows heat and airflow from the balance valve 102 to be ejected circumferentially, minimizing the impact of the ejected airflow on the aircraft's flight.

[0118] Please refer to Figures 8 and 9. The pressure relief hole 1a is located on the end cap 112, and the balance valve 102 is disposed on the circumferential surface of the housing 101. The end cap 112 of the housing 11 faces the side of the housing 101 where the balance valve 102 is located in the circumferential direction. In this way, the pressure relief hole 1a of the side-mounted battery cell pack 1 can face the balance valve 102.

[0119] This disclosure also provides an electrical device, including a battery 100 for providing electrical energy, as described in any embodiment of this disclosure.

[0120] This disclosure provides a battery cell assembly 1, including a housing 11, a pouch battery cell, a sealing strip, and a protective member 12. The housing 11 is rectangular and has a cavity inside, in which the pouch battery cell is housed. The housing 11 includes a shell 111, an end cap 112, and a blocking member 113. The shell 111 has a hollow structure with openings at both ends. The end cap 112 closes one end opening of the shell 111, and the blocking member 113 seals the other end opening of the shell 111. The sealing strip surrounds the shell 111 to seal the gap between the end cap 112 and the shell 111. The end cap 112 has a pressure relief area 1121 and a power connection area 1122. The pressure relief area 1121 has a pressure relief hole 1a communicating with the cavity, and the power connection area 1122 is used for electrical connection with the pouch battery cell. The protective member 12 includes mica paper, which can be opened and closed to cover the pressure relief hole 1a.

[0121] This embodiment of the disclosure incorporates at least two pouch cell batteries within a housing 11. A pressure relief hole 1a is provided on the end cap 112 of the housing 11 to allow for directional ejection of heat from the pouch cell batteries during thermal runaway, thus providing safety during such events. A pressure relief area 1121 and a contact area 1122 are separately provided on the end cap, allowing heat to escape from the pressure relief area 1121 during thermal runaway without significantly affecting the contact area 1122, further enhancing safety. Simultaneously, the sealing strip improves the sealing at the junction of the end cap 112 and the housing 111, and enhances the connection stability between them. Furthermore, the protective member 12, when covering the pressure relief hole 1a, provides some protection and prevents heat from being obstructed during ejection from the pouch cell batteries.

[0122] In the description of this specification, the references to "some embodiments," "other embodiments," and "exemplary" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the embodiments disclosed herein. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0123] The various embodiments / implementations provided in this disclosure can be combined with each other without creating contradictions. The above descriptions are merely preferred embodiments of this disclosure and are not intended to limit the scope of this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure. Industrial Applicability

[0124] This disclosure relates to the field of battery technology, providing a battery cell assembly, a battery, and an electrical device. The battery cell assembly includes a casing and pouch battery cells. The casing forms a cavity and a pressure relief hole communicating with the cavity. The casing includes an end cap, which includes a pressure relief area and a power connection area. The pressure relief area forms a pressure relief hole, and the power connection area is used for electrical connection with the pouch battery cells. At least two pouch battery cells are accommodated within the cavity. This disclosure also provides a battery, including a housing, a balance valve, and the battery cell assembly described in this disclosure. The housing has a placement cavity, the balance valve is disposed on the housing, and the battery cell assembly is located within the placement cavity of the housing. This disclosure also provides an electrical device, including the battery described in this disclosure for providing electrical energy. The battery cell assembly provided in this disclosure allows heat and gas generated during thermal runaway of the pouch battery cells to be directionally ejected through the pressure relief hole, preventing indiscriminate ejection and thus improving the safety of the pouch battery cells during thermal runaway.

Claims

1. A battery cell pack, comprising: The housing has a cavity and a pressure relief hole communicating with the cavity; the housing includes an end cap, the end cap including a pressure relief area and a power connection area, the pressure relief area having the pressure relief hole; A pouch cell, at least two of which are housed within the cavity, and the contact area is used for electrical connection with the pouch cell.

2. The battery cell pack according to claim 1, wherein, The outer casing includes a housing and an end cap. The housing has a hollow structure with a first opening at one end. The end cap closes the first opening, and the pressure relief hole is formed in the end cap.

3. The battery cell pack according to claim 2, wherein, The housing has a second opening at a second end away from the first opening, and the housing includes a blocking member that seals and closes the second opening.

4. The battery cell pack according to claim 2, wherein, The battery cell assembly includes a sealing strip that surrounds the housing to seal the gap between the end cap and the housing.

5. The battery cell pack according to any one of claims 1 to 4, wherein, The battery cell assembly includes a protective component that shields the pressure relief hole.

6. The battery cell pack according to claim 5, wherein, The protective component includes an opening and closing portion that can be opened and closed to cover the pressure relief hole.

7. A battery, comprising: The box body has a placement cavity; A balancing valve is installed on the housing; The battery cell assembly according to any one of claims 1 to 6, wherein the battery cell assembly is located within the placement cavity of the housing.

8. The battery according to claim 7, wherein, At least two of the battery cells are arranged in parallel to form a battery cell, and the pressure relief holes of each of the battery cells in the battery cell are oriented in the same direction.

9. The battery according to claim 8, wherein, The pressure relief holes of the two battery cells face opposite directions to form a module.

10. The battery according to any one of claims 7 to 9, wherein, The pressure relief hole faces the balance valve.

11. The battery according to claim 10, wherein, The balancing valve is located on the circumferential surface of the housing.

12. An electrical device comprising a battery according to any one of claims 7 to 11 for providing electrical energy.

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