Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack, which comprises a box body, a battery pack, a battery pack cover, a battery pack, a battery pack cover and a battery pack cover, and is characterized in that the box body is internally provided with an accommodating space; the enclosure structure comprises an assembly covering the multiple battery cells, a mounting space is formed in the enclosure structure, exhaust holes are formed in the side wall, corresponding to the mounting space, of the enclosure structure, and the enclosure structure comprises separation blades covering the exhaust holes; and the plurality of battery cells are correspondingly arranged in the mounting spaces. According to the utility model, the enclosure structure and the battery cell can be encircled to form the air chamber, when smoke of the battery cell enters the air chamber and the pressure in the air chamber is too large, the smoke breaks through the baffle plate and is exhausted outwards through the exhaust channel, and the pressure in the air chamber is released at the moment; and the baffle sheets at the exhaust holes of the other air chambers can prevent smoke in the exhaust channels from entering, so that the exhaust function of the single air chamber is realized, and the smoke can be prevented from influencing the other battery cells at the same time.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery packs. Background Technology

[0002] With the continuous development of electric bicycle technology, the requirements for their safety are also constantly increasing. Electric bicycles typically use lithium-ion batteries for power. These batteries are susceptible to thermal runaway under conditions such as overcharging, over-discharging, internal short circuits, or external impacts. As the internal temperature of the battery rises rapidly, it can easily trigger a chain reaction that endangers personal safety and property. The thermal runaway problem of batteries has become one of the key factors restricting their widespread application in the electric bicycle industry.

[0003] Currently, existing batteries often neglect the need for smoke exhaust in the event of thermal runaway. When a single cell in a battery experiences thermal runaway, the smoke inside cannot be effectively exhausted. The smoke will accumulate inside the battery and affect other cells. This situation will further aggravate the severity of thermal runaway, making the battery more susceptible to thermal diffusion and fire. Utility Model Content

[0004] In view of this, the present invention provides a battery pack and an electric vehicle to solve the problem that existing batteries have difficulty in effectively venting smoke during thermal runaway.

[0005] In a first aspect, this utility model provides a battery pack, comprising: a housing, multiple battery cells, and an enclosure structure; the housing has a length extending in a first direction, and has an internal space for accommodating the battery cells, the inner wall of the housing is provided with an exhaust channel for communicating with the outside, the exhaust channel extending in the first direction; the enclosure structure includes an assembly covering the multiple battery cells, an installation space is formed inside the enclosure structure, at least one exhaust hole is provided on the side wall of the enclosure structure corresponding to the installation space, the enclosure structure includes a baffle covering the exhaust hole, the baffle being a pre-formed weak area on the side wall of the enclosure structure; the multiple battery cells are stacked along the first direction; and the multiple battery cells are correspondingly disposed in the installation space, the battery cells in the installation space and the enclosure structure enclose a closed air chamber.

[0006] Beneficial effects: An exhaust channel is set on the inner wall of the casing, and an enclosing structure is set inside. The enclosing structure is used to install the battery cells and can also form an air chamber with the battery cells. When a battery cell experiences thermal runaway, the flue gas inside the battery cell will first enter the air chamber after it pushes open its own outer shell. When the pressure in the air chamber is too high, the flue gas will break through the baffle and be discharged outward through the exhaust channel. At this time, the pressure in the air chamber is released. Since the pressure in the exhaust channel is low at this time, the baffles at the exhaust holes of the other air chambers will block the flue gas from entering the exhaust channel. This not only realizes the exhaust function of a single air chamber, but also prevents the flue gas from affecting the other battery cells, effectively solving the problem of the difficulty in effectively venting flue gas when the existing battery experiences thermal runaway.

[0007] In one alternative embodiment, the enclosure structure includes a barrier portion disposed on the side of the battery cell, and on the barrier portion in the second direction, a plurality of vent holes are arranged in a spaced manner corresponding to the air chamber along the first direction.

[0008] Beneficial effects: The enclosed structure has simple and reliable component forms.

[0009] In one alternative embodiment, the battery pack further includes a circuit board assembly connected to a retaining portion on the side of the cell in a third-direction orientation where the tabs of the cell extend; the circuit board assembly has slits for the tabs to pass through.

[0010] Beneficial effects: The circuit board assembly can effectively seal the top of the battery cell while allowing the battery cell tabs to pass through, facilitating the connection process between the battery cells.

[0011] In one alternative embodiment, the enclosure includes a side panel assembly disposed on the side of the battery cell, and a plurality of partition assemblies stacked with the battery cell, the plurality of partition assemblies being spaced apart along a first direction to form a plurality of installation spaces.

[0012] Beneficial effects: The structure of the enclosure is simple and reliable. The side walls of the battery cell can be enclosed by only the side baffle assembly and multiple partition assemblies. The side baffle assembly, side baffle assembly and partition assemblies can be assembled and manufactured separately, which can greatly reduce the manufacturing difficulty compared to the integrated enclosure.

[0013] In one alternative embodiment, the side guard assembly includes a first blocking layer and a second blocking layer, which are stacked along a second direction, with the first blocking layer disposed close to the mounting space; the area of ​​the vent hole varies within the second blocking layer and the first blocking layer.

[0014] Beneficial effect: The pressure of the baffle opening in reverse from the exhaust channel to the air chamber is greater than the pressure of the baffle opening in the forward direction from the air chamber, which can further improve the blocking reliability of the baffle and prevent the flue gas in the exhaust channel from entering the unopened air chamber.

[0015] In one alternative embodiment, the battery pack further includes a venting structure, the side baffle assembly abutting against the inner wall of the housing via the venting structure, and the exhaust port communicating with the air inlet of the exhaust channel via the venting structure.

[0016] Beneficial effect: By setting up an air guide structure, the reliability of exhaust during exhaust can be improved.

[0017] In one alternative implementation, the circuit board assembly includes a circuit board and a seal disposed at the location of the slit.

[0018] Beneficial effects: This type of circuit board assembly has a simple and reliable structure. The mating positions of the tabs and slits can be sealed by the sealant. Compared with the sealing operation of potting glue into the circuit board, it can significantly reduce the sealing difficulty and the weight of the battery pack.

[0019] In one alternative embodiment, the separating component includes a buffer structure and a second insulating sheet, the buffer structure forming a mating surface corresponding to the wall surface of an adjacent mounting space, and each mating surface is provided with a second insulating sheet.

[0020] Beneficial effects: The buffer structure can reduce the impact of external forces on the battery cell and prevent damage caused by concentrated local forces.

[0021] In one alternative embodiment, the buffer structure includes a foam layer and an aerogel layer disposed between the foam layer and the second insulating sheet.

[0022] Beneficial effects: The structure is simple and reliable. The foam layer and aerogel layer have low density and good support. The aerogel layer has stable chemical properties and good heat resistance. Compared with the isolation method of potting glue between two cells, it has stronger heat insulation performance and buffering capacity, while also significantly reducing the weight of the battery pack.

[0023] In one optional embodiment, the enclosure includes a main body and a top cover. The main body has a receiving space, and at least one end of the main body along a first direction is provided with an assembly port communicating with the receiving space. The top cover is detachably assembled to at least one of the assembly ports. An exhaust channel extends along the first direction. The inner wall of the main body has an air inlet communicating with the exhaust channel. The end face of the main body and the top cover is assembled with an air outlet communicating with the exhaust channel. The top cover has an exhaust chamber corresponding to and communicating with the air outlet. An explosion-proof valve is provided at the connection hole connecting the exhaust chamber to the outside.

[0024] Beneficial effects: The structure of the box is simple and reliable, and easy to process and manufacture. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is an exploded schematic diagram of a battery pack according to an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A 3D schematic diagram of the battery module in the battery pack shown;

[0028] Figure 3 for Figure 2 A three-dimensional schematic diagram of the circuit board assembly of the battery module in an exploded state;

[0029] Figure 4 for Figure 2 The battery module shown is a 3D schematic diagram with the circuit board assembly not shown and the side panel assembly in an exploded state.

[0030] Figure 5 for Figure 2 An exploded view of the battery module's partition components and cells;

[0031] Figure 6 for Figure 2 The diagram shown is a cross-sectional view of the battery module without a busbar.

[0032] Figure 7 for Figure 5 An exploded view of the partition assembly shown;

[0033] Figure 8 for Figure 1 A three-dimensional schematic diagram of the battery pack casing shown;

[0034] Figure 9 for Figure 8 A three-dimensional schematic diagram of the main body of the box shown;

[0035] Figure 10 for Figure 9 A cross-sectional view of the main body shown;

[0036] Figure 11 for Figure 8 The diagram shows the explosion-proof valve and the top cover of the enclosure.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Battery module; 100. Enclosure structure; 101. Enclosure section;

[0039] 102. Side shield assembly; 1021. Exhaust port; 1022. Baffle plate; 1023. First blocking layer; 1024. Second blocking layer; 1025. Through hole; 1026. Exhaust area;

[0040] 103. Circuit board assembly; 1031. Circuit board; 10311. Slit; 1032. Seal; 1033. Busbar;

[0041] 104. Separator assembly; 1041. Second insulating sheet; 1042. Foam layer; 1043. Aerogel layer;

[0042] 105. Air guiding structure; 106. Supporting components;

[0043] 200. Battery cell; 201. Electrode; 202. Gas chamber;

[0044] 4. Housing; 401. Accommodation space; 402. Exhaust passage; 4021. Air inlet; 4022. Air outlet; 403. Main body; 404. Top cover; 4041. Exhaust chamber; 405. Explosion-proof valve; 406. Base plate. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0046] The following is combined with Figures 1 to 11 The following describes embodiments of the present invention.

[0047] According to an embodiment of the present invention, a battery pack is provided, having dimensions in a first direction. The battery pack includes: a housing 4, a plurality of battery cells 200, and an enclosure structure 100. The housing 4 has a length extending in the first direction and has an internal accommodating space 401 for accommodating the battery cells 200. The inner wall of the housing 4 is provided with an exhaust channel 402 for communicating with the outside, and the exhaust channel 402 extends in the first direction. The enclosure structure 100 includes components covering the plurality of battery cells 200. An installation space is formed inside the enclosure structure 100. At least one exhaust hole 1021 is provided on the side wall of the enclosure structure 100 corresponding to the installation space. The enclosure structure 100 includes a baffle 1022 covering the exhaust hole 1021. The baffle 1022 is a pre-formed weak area on the side wall of the enclosure structure 100. The plurality of battery cells 200 are stacked along the first direction. The plurality of battery cells 200 are correspondingly disposed in the installation space, and the battery cells 200 in the installation space and the enclosure structure 100 enclose a closed air chamber 202.

[0048] The baffle 1022 has a blocking state that blocks the exhaust port 1021 and an exhaust state that is opened by the flue gas in the installation space; in the exhaust state, the gas chamber 202 is connected to the exhaust channel 402 through the exhaust port 1021.

[0049] The battery pack of this embodiment has an exhaust channel 402 on the inner wall of the housing 4 and an enclosing structure 100 inside. The enclosing structure 100 is used to install the battery cell 200 and can also enclose the battery cell 200 to form an air chamber 202. When a battery cell 200 experiences thermal runaway, the smoke inside the battery cell 200 will first enter the air chamber 202 after it breaks through its own outer shell. When the pressure in the air chamber 202 is too high, the smoke will break through the baffle 1022 and be discharged outward through the exhaust channel 402. At this time, the pressure in the air chamber 202 is released. Since the pressure in the exhaust channel 402 is low at this time, the baffles 1022 at the exhaust holes 1021 of the other air chambers 202 will block the smoke from entering the exhaust channel 402. This not only realizes the exhaust function of a single air chamber 202, but also prevents the smoke from affecting the other battery cells 200, effectively solving the problem that it is difficult to effectively discharge smoke when the existing battery experiences thermal runaway.

[0050] It should be noted that the enclosure structure 100 refers to the structure that encloses and forms the installation space. The enclosure structure 100 can be assembled from multiple components or it can be integrally formed. The air chamber 202 refers to the cavity formed by the outer wall of the battery cell 200 and the inner wall of the installation space of the enclosure structure 100 after the battery cell 200 is installed in the installation space. The exhaust port 1021 is provided correspondingly to the air chamber 202.

[0051] In addition, in this application, "first direction" refers to Figure 1The "first direction" indicated by the middle arrow, and the "second direction" refer to... Figure 1 The "second direction" indicated by the middle arrow, and the "third direction" refer to... Figure 1 The middle arrow points to the "third direction".

[0052] Specifically, there is no limitation on the way the baffle 1022 is set. It can be connected to the vent hole 1021 by means of bonding, snap-fit, or other connection methods. Alternatively, the enclosing structure 100 can be formed into a hole-like structure by continuous scoring at the position of the vent hole 1021. The space enclosed by the scoring is the vent hole 1021, and the part of the enclosing structure 100 enclosed by the scoring is the baffle 1022. The choice can be made flexibly according to the requirements.

[0053] In one possible implementation, the battery pack also has dimensions in a second direction intersecting the first direction and in a third direction. The enclosure structure 100 includes a barrier portion 101 disposed on the side of the cell 200. On the barrier portion 101 in the second direction, a plurality of vent holes 1021 are arranged in a spaced manner corresponding to the air chamber 202 along the first direction. The components of the enclosure structure 100 are simple and reliable.

[0054] Specifically, the structural form of the enclosure part 101 is not limited. It can be a groove-shaped structure with enclosure structure in all positions except for its own opening, or it can be a hole-shaped structure with opening in the position opposite to the opening in the enclosure part 101. It can be flexibly selected according to the needs. The enclosure part 101 only needs to be able to enclose the air chamber 202 with the circuit board assembly 103 and the battery cell 200 respectively.

[0055] In one possible implementation, the battery pack further includes a circuit board assembly 103, which is connected to a retaining portion 101 on the side of the cell 200 in a third-direction orientation where the tabs 201 of the cell 200 extend. The circuit board assembly 103 has a slit 10311 for the tabs 201 to pass through. The circuit board assembly 103 can effectively seal the top of the cell 200 while allowing the tabs 201 of the cell 200 to pass through, facilitating the connection steps between the cells 200.

[0056] Specifically, the vent 1021 is located on the side wall of the enclosure 101, and the enclosure 101 has an opening communicating with the installation space at one end along a third direction; the circuit board assembly 103 is connected to the enclosure 101 and seals the opening of the enclosure 101, and the battery cell 200 has a tab 201 on the side facing the opening of the enclosure 101; the circuit board assembly 103 has a slit 10311 for the tab 201 to pass through. The enclosure structure 100 has simple and reliable components. The circuit board assembly 103 can effectively seal the opening of the enclosure 101, and at the same time allow the tab 201 of the battery cell 200 to pass through, so as to facilitate the connection steps between the battery cells 200.

[0057] In one possible implementation, the enclosure 101 includes a side baffle assembly 102 disposed on the side of the battery cell 200, and a plurality of partition assemblies 104 stacked with the battery cell 200. The partition assemblies 104 are spaced apart along a first direction to form a plurality of installation spaces. The enclosure 101 has a simple and reliable structure. The side baffle assembly 102 and the plurality of partition assemblies 104 are sufficient to enclose the side wall of the battery cell 200. The side baffle assembly 102 and the partition assemblies 104 can be assembled and manufactured separately, which greatly reduces the manufacturing difficulty compared to an integrated enclosure 101.

[0058] Specifically, the enclosure 101 includes two side barrier assemblies 102 and a plurality of partition assemblies 104. The plurality of partition assemblies 104 are spaced apart along a first direction, and an installation space is formed between adjacent partition assemblies 104. The two side barrier assemblies 102 extend along the first direction and are located on both sides of the plurality of partition assemblies 104 in a second direction. The two side barrier assemblies 102 are respectively connected to each partition assembly 104. At least one side barrier assembly 102 is provided with an exhaust hole 1021.

[0059] Furthermore, since the seam of the battery cell 200 casing is usually located near the end with the tab 201, and the seam is relatively thin, when the battery cell 200 experiences thermal runaway, the flue gas inside will fill the casing and be discharged through the seam. Therefore, it is only necessary for the gas chamber 202 to correspond to the end of the battery cell 200 with the tab 201. After this type of enclosure 101 is connected to the circuit board assembly 103, a gas chamber 202 can be formed at the end of the battery cell 200 with the tab 201, which avoids setting a sealing structure at the end of the battery cell 200 away from the tab 201, effectively saving the number of parts and further reducing the manufacturing difficulty.

[0060] The number of battery cells 200 in each air chamber 202 is not limited; it can be one battery cell 200 or two or more battery cells 200 arranged in parallel, which can be flexibly selected. The specific location and number of exhaust holes 1021 are not limited; each air chamber 202 can have an exhaust hole 1021 on one of the side baffle components 102, or it can have an exhaust hole 1021 on both of the side baffle components 102.

[0061] Preferably, in order to avoid heat conduction when there are multiple battery cells 200 in each air chamber 202, each air chamber 202 corresponds to only one battery cell 200.

[0062] In one possible implementation, the exhaust port 1021 includes a first segment and a second segment arranged sequentially along a direction away from the installation space. Along this second direction, the projection of the connection point between the first and second segments lies inside the projection of the second segment. A baffle 1022 connects to and covers the second segment. The connection surface between the second and first segments forms a stepped surface, which abuts against the baffle 1022. With this arrangement, when the flue gas in the exhaust channel 402 impacts the baffle 1022 in the unopened chamber 202, a portion of the baffle 1022 will abut against the stepped surface. This allows the pressure at which the baffle 1022 opens in the reverse direction from the exhaust channel 402 to the chamber 202 to be greater than the pressure at which the baffle 1022 opens in the forward direction from the chamber 202. This further improves the blocking reliability of the baffle 1022, preventing the flue gas in the exhaust channel 402 from entering the unopened chamber 202.

[0063] In one possible implementation, the side shield assembly 102 includes a first blocking layer 1023 and a second blocking layer 1024, which are stacked along a second direction, with the first blocking layer 1023 disposed close to the mounting space; the area of ​​the vent 1021 within the second blocking layer 1024 and the first blocking layer 1023 varies.

[0064] Specifically, the side baffle assembly 102 with a first blocking layer 1023 and a second blocking layer 1024 is a side baffle assembly 102 with an exhaust hole 1021. The first blocking layer 1023 and the second blocking layer 1024 are stacked along the second direction, and the first blocking layer 1023 is located close to the installation space. The second hole is opened in the second blocking layer 1024 and the first hole is opened in the first blocking layer 1023. The side baffle assembly 102 has a simple and reliable structure. The exhaust hole 1021 arranged in this way can avoid the structural strength of the housing 4 being affected by the large number of exhaust channels 402 dispersed on the housing 4.

[0065] Furthermore, at least two exhaust ports 1021 corresponding to the air chambers 202 are simultaneously connected to an exhaust channel 402, and all exhaust ports 1021 are located in the same location, such as... Figure 4 As shown, the side guard assembly 102 with an exhaust port 1021 is the first side guard assembly, and the side guard assembly without an exhaust port 1021 is the second side guard assembly. The second side guard assembly only needs to have a complete blocking layer to meet the usage requirements.

[0066] Preferably, such as Figure 4 As shown, the exhaust hole 1021 on the second barrier layer 1024 is the second hole segment, and the through hole 1025 on the first barrier layer 1023 is the first hole segment. The cross-sectional area of ​​the through hole 1025 is smaller than the cross-sectional area of ​​the corresponding exhaust hole 1021. When the flue gas in the exhaust channel 402 impacts the baffle 1022 of the unopened air chamber 202, a part of the baffle 1022 will abut against the periphery of the first barrier layer 1023 located at the through hole 1025.

[0067] It is understood that, as an alternative implementation, both the first side block assembly and the second side block assembly may be provided with an exhaust passage 402, and the exhaust holes 1021 of at least two air chambers 202 may share a single exhaust passage 402.

[0068] The specific shapes of the through hole 1025 and the vent hole 1021 are not limited and can be circular, rectangular, triangular, etc., and can be selected according to the ease of manufacturing. The shapes of the through hole 1025 and the vent hole 1021 can also be the same or different, and can be flexibly selected according to the requirements.

[0069] Preferably, the through hole 1025 and the vent hole 1021 are strip-shaped holes with the same shape but different proportions.

[0070] In one possible implementation, such as Figure 4 As shown, all the exhaust holes 1021 are located on the same side baffle assembly 102. Multiple exhaust holes 1021 are connected to one exhaust channel 402 at the same time. Only one exhaust channel 402 is needed to ensure that each exhaust hole 1021 can reliably exhaust air, which can greatly reduce the structural complexity of the housing 4.

[0071] In one possible implementation, the battery module 1 further includes a venting structure 105. The side baffle assembly 102 abuts against the inner wall of the housing 4 through the venting structure 105. The exhaust port 1021 is connected to the air inlet 4021 of the exhaust channel 402 through the venting structure 105. The side baffle assembly 102 abuts against the inner wall of the housing 4 through the venting structure 105. By setting the venting structure 105, the reliability of the exhaust port 1021 during exhaust can be improved.

[0072] Specifically, the exhaust holes 1021 are all located in the first side baffle assembly, the second baffle layer 1024 has an exhaust area 1026 extending along the first direction, and the air guiding structure 105 is arranged around the exhaust area 1026. Since the air guiding structure 105 is provided, the air guiding structure 105 can form a reliable guiding space with the exhaust area 1026 at the entrance of the exhaust channel 402. When the box 4 is fixed with glue inside, the glue can be prevented from blocking the exhaust holes 1021.

[0073] In one possible implementation, two side baffle assemblies 102 are respectively connected to both sides of each cell 200 along the second direction, which can further improve the stability and effectiveness of forming the air chamber 202.

[0074] Specifically, the two side baffle assemblies 102 are respectively bonded to each battery cell 200.

[0075] The specific types of the first and second side barrier assemblies are not limited. The first barrier layer 1023, the second barrier layer 1024, and the second side barrier assembly are all insulating and heat-resistant plate structures, including but not limited to nylon plates, rubber plates, mica plates, etc.

[0076] Preferably, the first barrier layer 1023, the second barrier layer 1024, and the second side barrier assembly are all mica paper.

[0077] In one possible implementation, the enclosure 101 further includes a support member 106 disposed on the side of the plurality of partition components 104 away from the circuit board assembly 103. The support member 106 abuts against each partition component 104 and each battery cell 200 respectively. The support member 106 can prevent misalignment between the partition component 104 and the battery cell 200, and can also prevent the partition component 104 and the battery cell 200 from directly contacting the housing 4.

[0078] Specifically, such as Figure 2 As shown, the support member 106 is a foot strip disposed on the side of the separator assembly 104 away from the circuit board assembly 103.

[0079] In one possible implementation, such as Figure 3 and Figure 6 As shown, the circuit board assembly 103 includes a circuit board 1031 and a seal 1032, with the seal 1032 disposed at the location of the slit 10311.

[0080] The sealing element 1032 is an elastic element and is located between the slit 10311 and the tab 201. The tab 201 abuts against the slit 10311 through the sealing element 1032.

[0081] Specifically, such as Figure 2 and Figure 3As shown, the circuit board assembly 103 also includes a busbar 1033. The positive tabs 201 of adjacent cells 200 are connected together, and the negative tabs 201 of adjacent cells 200 are connected together to form a group of cells 200. Multiple groups of cells 200 are connected in series through the busbar 1033. In adjacent groups of cells 200, the positive tab 201 of one group of cells 200 is connected to the negative tab 201 of another group of cells 200 through the busbar 1033. This process is repeated to form two cells 200 connected in parallel to form a group of cells 200 and multiple groups of cells 200 connected in series.

[0082] In one possible implementation, the seal 1032 is a foamed ceramic silicone rubber component. This type of seal 1032 not only has a good sealing effect, but also has better insulation and heat resistance.

[0083] In one possible implementation, the circuit board assembly 103 further includes a first insulating sheet disposed on the wall of the circuit board 1031 near the mounting space. The first insulating sheet can effectively prevent the circuit board 1031 from directly contacting the battery cell 200, thereby improving safety.

[0084] Specifically, there are no restrictions on the material of the first insulating sheet; it can be nylon, rubber, mica, etc.

[0085] Preferably, the first insulating sheet is mica paper.

[0086] In one possible implementation, such as Figure 7 As shown, the separator 104 includes a buffer structure and a second insulating sheet 1041. The buffer structure forms a mating surface with the wall of the adjacent installation space. Each mating surface is provided with a second insulating sheet 1041. The buffer structure can reduce the impact of the external environment on the battery cell 200 and avoid damage caused by localized force concentration on the battery cell 200.

[0087] Preferably, the second insulating sheet 1041 is mica paper.

[0088] In one possible implementation, the buffer structure includes a foam layer 1042 and an aerogel layer 1043, with the aerogel layer 1043 located between the foam layer 1042 and the second insulating sheet 1041. The structure is simple and reliable, with the foam layer 1042 and the aerogel layer 1043 having low density and good support. The aerogel layer 1043 has stable chemical properties and good heat resistance. Compared with the isolation method of potting glue between the two cells 200, the heat insulation performance and buffering capacity are stronger, while the weight of the battery pack can be significantly reduced.

[0089] In one possible implementation, the housing 4 includes a main body 403 and a top cover 404. The main body 403 has a receiving space 401. At least one end of the main body 403 along a first direction is provided with an assembly port communicating with the receiving space 401. The top cover 404 is detachably assembled to at least one of the assembly ports. An exhaust channel 402 extends along the first direction. The inner wall of the main body 403 has an air inlet 4021 communicating with the exhaust channel 402. The end face of the main body 403 and the top cover 404 is provided with an air outlet 4022 communicating with the exhaust channel 402. The top cover 404 has an exhaust chamber 4041 corresponding to and communicating with the air outlet 4022. An explosion-proof valve 405 is provided at the connection hole of the exhaust chamber 4041 communicating with the outside. The structure of the housing 4 is simple and reliable, and easy to process and manufacture.

[0090] It should be noted that the opening pressure of the explosion-proof valve 405 is less than the pressure at which the baffle 1022 opens in the reverse direction.

[0091] Specifically, the main body 403 has a detachable base plate 406 at the end away from the top cover 404.

[0092] In one possible implementation, the main body 403 is formed by enclosing multiple plates, with the connection position of adjacent plates being the corner position of the main body 403. The exhaust channel 402 is located at the corner position of the main body 403, and the structural strength of the corner position of the main body 403 is relatively high. This arrangement of the exhaust channel 402 can avoid further reducing the structural strength of the weaker position in the middle of the side wall of the main body 403.

[0093] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: Box (4), multiple battery cells (200), enclosed structure (100); The housing (4) has a length extending in a first direction and an internal accommodating space (401) for accommodating the battery cell (200). The inner wall of the housing (4) is provided with an exhaust channel (402) for communicating with the outside. The exhaust channel (402) extends in the first direction. The enclosure structure (100) includes an assembly covering multiple battery cells (200), an installation space is formed inside the enclosure structure (100), and at least one vent (1021) is provided on the side wall of the enclosure structure (100) corresponding to the installation space. The enclosure structure (100) includes a baffle (1022) covering the vent (1021), and the baffle (1022) is a pre-formed weak area on the side wall of the enclosure structure (100). Multiple battery cells (200) are stacked along the first direction; and the multiple battery cells (200) are correspondingly disposed in the mounting space, wherein the battery cells (200) in the mounting space are enclosed by the enclosing structure (100) to form a closed air chamber (202).

2. The battery pack according to claim 1, characterized in that, The enclosure structure (100) includes a barrier portion (101) disposed on the side of the battery cell (200). On the barrier portion (101) in the second direction, a plurality of exhaust holes (1021) are arranged in a spaced manner along the first direction, corresponding to the air chamber (202).

3. The battery pack according to claim 2, characterized in that, The battery pack also includes a circuit board assembly (103) extending in the third direction from the tab (201) of the cell (200), and the circuit board assembly (103) is connected to the enclosure portion (101) on the side of the cell (200); the circuit board assembly (103) has a slit (10311) through which the tab (201) passes.

4. The battery pack according to claim 3, characterized in that, The enclosure (101) includes a side guard assembly (102) disposed on the side of the battery cell (200) and a plurality of partition assemblies (104) stacked with the battery cell (200). The plurality of partition assemblies (104) are spaced apart along the first direction to form a plurality of installation spaces.

5. The battery pack according to claim 4, characterized in that, The side shield assembly (102) includes a first blocking layer (1023) and a second blocking layer (1024), the first blocking layer (1023) and the second blocking layer (1024) are stacked along a second direction, and the first blocking layer (1023) is disposed close to the installation space; the area of ​​the exhaust hole (1021) varies within the second blocking layer (1024) and the first blocking layer (1023).

6. The battery pack according to claim 5, characterized in that, The battery pack also includes an air guide structure (105), the side baffle assembly (102) abuts against the inner wall of the housing (4) through the air guide structure (105), and the exhaust port (1021) is connected to the air inlet (4021) of the exhaust channel (402) through the air guide structure (105).

7. The battery pack according to any one of claims 3 to 6, characterized in that, The circuit board assembly (103) includes a circuit board (1031) and a seal (1032) disposed at the location of the slit (10311).

8. The battery pack according to any one of claims 4 to 6, characterized in that, The partition assembly (104) includes a buffer structure and a second insulating sheet (1041). The buffer structure forms a mating surface with the wall of the adjacent installation space, and each mating surface is provided with the second insulating sheet (1041).

9. The battery pack according to claim 8, characterized in that, The buffer structure includes a foam layer (1042) and an aerogel layer (1043), wherein the aerogel layer (1043) is located between the foam layer (1042) and the second insulating sheet (1041).

10. The battery pack according to any one of claims 1 to 6, characterized in that, The housing (4) includes a main body (403) and a top cover (404). The main body (403) has the accommodating space (401). The main body (403) has an assembly port communicating with the accommodating space (401) at at least one end along the first direction. The top cover (404) is detachably assembled at at least one of the assembly ports. The exhaust channel (402) extends along the first direction. The inner wall of the main body (403) has an air inlet (4021) communicating with the exhaust channel (402). The end face of the main body (403) assembled with the top cover (404) has an air outlet (4022) communicating with the exhaust channel (402). The top cover (404) has an exhaust chamber (4041) corresponding to and communicating with the air outlet (4022). An explosion-proof valve (405) is provided at the connection hole of the exhaust chamber (4041) communicating with the outside.

Images