Battery pack and electric device

Abstract

This application relates to the field of battery technology and discloses a battery pack and an electrical device. The battery pack includes a casing, a support, a cell assembly, and N first adhesive members. The casing includes N first through holes. The support is disposed within the casing and includes N first openings, each first opening facing a different first through hole. The cell assembly is disposed within the support and includes N cells arranged along a first direction. Each cell includes a bottom wall and a top cover, and a peripheral sidewall connecting the bottom wall and the top cover, a portion of each peripheral sidewall facing a different first opening. Each first adhesive member adheres to the casing, the support, and a different cell, a portion of each first adhesive member located in a first through hole and a first opening facing that first through hole.

Description

Technical Field

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

[0002] A battery pack consists of multiple cells, which are assembled inside a casing and electrically connected to each other to supply power to electrical devices. When the battery pack is subjected to conditions such as vibration, dynamics, or impact, some cells may move relative to the casing, affecting the connection stability of the battery pack. Summary of the Invention

[0003] The purpose of this application is to provide a battery pack and an electrical device that improves the connection stability of the battery pack.

[0004] According to a first aspect of this application, a battery pack is provided, including a housing, a bracket, a cell assembly, and N first adhesive members. The housing includes N first through holes, where N is a natural number greater than 0. The bracket is disposed within the housing and includes N first openings, each first opening facing a different first through hole. The cell assembly is disposed within the bracket and includes N cells arranged along a first direction. Each cell includes a bottom wall and a top cover, and a peripheral sidewall connecting the bottom wall and the top cover, a portion of each peripheral sidewall facing a different first opening. Each first adhesive member adhesively attaches to the housing, the bracket, and a different cell, a portion of each first adhesive member located in a first through hole and a first opening facing that first through hole.

[0005] In one or more of the above alternative embodiments, a portion of each first adhesive member is located between the housing and the bracket, and another portion is located between the bracket and the peripheral sidewall.

[0006] In one or more of the above optional embodiments, the housing includes 2N second through holes. A second through hole is provided on each of the opposite sides of any first through hole along a first direction, and a first through hole and the second through holes located on both sides of the first through hole face the same battery cell.

[0007] In one or more of the above optional embodiments, the distance between two second through holes facing the same cell along the first direction is L1mm, the length of the cell is L2mm, and L1 and L2 satisfy: 1 / 3≤L1 / L2≤2 / 3.

[0008] In one or more of the above alternative embodiments, the battery cell includes a cylindrical battery cell.

[0009] In one or more of the above optional embodiments, a gap is provided between adjacent cells along a first direction. The battery pack includes a vent and a channel. The vent is located in the housing, and the channel is located between the housing and the support. The gap and the channel communicate, and the vent is configured to discharge gas from the channel. N first adhesive members are spaced apart from the channel.

[0010] In one or more of the above optional embodiments, each battery cell includes a first electrode portion and a second electrode portion, with a top cover serving as the second electrode portion of the battery cell. The top cover includes a vent port communicating with the external space of the battery cell. The battery cell includes a venting portion. A first space is formed between the top cover and the venting portion. The first space communicates with the vent port. N first adhesive members are spaced apart from the vent port, and N first adhesive members are spaced apart from the first space.

[0011] In one or more of the above optional embodiments, the battery pack includes N-1 busbar assemblies. Each busbar assembly includes a first busbar and a second busbar. Along a first direction, portions of the second busbar and the first busbar are located between adjacent battery cells. The second busbar is connected to the second electrode portion of a battery cell, and the first busbar is connected to the first or second electrode portion of an adjacent battery cell. N first adhesive members and the first busbar are spaced apart, and N first adhesive members and the second busbar are spaced apart.

[0012] In one or more of the above optional embodiments, the battery pack includes a data acquisition component and N-1 insulators. The insulators are located between adjacent battery cells. The support includes a third opening. The insulators have a first notch, and a first bus and a second bus located between adjacent battery cells pass through the same first notch and the same third opening and are connected to the data acquisition component. A gap is formed between the insulators and at least one battery cell.

[0013] In one or more of the above optional embodiments, the support includes a first receiving groove. The first receiving groove is disposed on the side of the support away from the cell assembly. The support includes a main body portion and a first protrusion and a second protrusion connected to the main body portion. A portion of the main body portion, the first protrusion, and the second protrusion form the first receiving groove. The battery pack includes a first conductive element. The first conductive element is disposed in the first receiving groove and connected to the cell assembly. Along the circumferential direction of the cell assembly, a channel is disposed adjacent to the first receiving groove.

[0014] In one or more of the above optional embodiments, the housing includes a limiting portion. Along the circumferential direction of the cell assembly, the support includes a third protrusion spaced apart from the second protrusion. A portion of the main body, the second protrusion, and the third protrusion form a second receiving groove, in which the limiting portion is disposed.

[0015] In one or more of the above optional embodiments, along the circumferential direction of the cell assembly, the support includes a fourth protrusion and a fifth protrusion spaced apart. A portion of the main body, the fourth protrusion, and the fifth protrusion form a third receiving groove. The battery pack includes a data acquisition component. The data acquisition component is at least partially disposed in the third receiving groove, and the data acquisition component is configured to acquire and transmit parameters of the cell assembly. Along the circumferential direction of the cell assembly, a channel, a first conductive element, a limiting portion, and the data acquisition component are sequentially arranged.

[0016] In one or more of the above optional embodiments, the acquisition component includes a first circuit board and a plurality of conductive sheets. The plurality of conductive sheets are disposed on the first circuit board and are configured to acquire parameters of the battery cell assembly. Along the circumference of the battery cell assembly, the channel, the first conductive element, the limiting part, and the first circuit board are arranged sequentially.

[0017] In one or more of the above optional embodiments, the support includes a first support and a second support. The first support and the second support are connected to form a receiving space. The battery cell assembly is located within the receiving space. N first openings are provided on the first support, along the circumference of the battery cell assembly, and a fifth protrusion is located between the fourth protrusion and the first openings.

[0018] In one or more of the above optional embodiments, the first protrusion and the second protrusion are disposed on the first bracket. A portion of the first bracket, the first protrusion, and a portion of the outer casing form a channel.

[0019] In one or more of the above optional embodiments, the housing includes M third through holes, where M is a natural number greater than 0. The second bracket includes M second openings. Each second opening faces a different third through hole, and a portion of each peripheral sidewall faces a different second opening. The battery pack includes M second adhesive members. Each second adhesive member adhesively bonds the housing, the bracket, and a different battery cell. A portion of each second adhesive member is located between a third through hole and a second opening facing a third through hole, and a portion is located between the housing and the bracket, and a portion is located between the bracket and the peripheral sidewall.

[0020] In one or more of the above optional embodiments, a portion of the first adhesive is accommodated in the second through hole, and the first adhesive can close the second through hole.

[0021] In one or more of the above optional embodiments, the diameter of the second through hole is smaller than the diameter of the first through hole.

[0022] In one or more of the above optional embodiments, the exhaust opening extends through the first bracket, and the exhaust opening connects the gap and the channel.

[0023] According to a second aspect of this application, an electrical device is provided, which includes a battery pack as described above.

[0024] The battery pack involved in this application has cell components bonded and fixed to the bracket and the outer casing by N first adhesive members. When the battery pack is under working conditions such as vibration, dynamics, or impact, the N first adhesive members together restrict the movement of the cell components relative to the outer casing, thereby improving the connection strength and stability between the cell components and the outer casing.

[0025] Additional aspects and advantages of the embodiments of this application will be described, shown, or illustrated in part by way of implementation of the embodiments of this application in the following description. Attached Figure Description

[0026] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the dimensions in the drawings do not constitute a limitation on scale.

[0027] Figure 1 This is a schematic diagram of the structure of a battery pack provided in one embodiment of this application;

[0028] Figure 2 for Figure 1 A schematic diagram of the battery pack structure shown from another angle;

[0029] Figure 3 for Figure 1 The exploded view of the battery pack structure is shown.

[0030] Figure 4 for Figure 1 The diagram shown is a structural schematic of the battery pack after omitting the casing and some electrical components;

[0031] Figure 5 for Figure 1 The diagram shown is a structural schematic of the battery pack without its outer casing.

[0032] Figure 6 for Figure 5 The diagram shows the battery pack structure from another angle with the outer casing removed.

[0033] Figure 7 for Figure 4 A magnified view of a section at point A in the middle;

[0034] Figure 8 for Figure 1 Enlarged view of the section cut along line AA;

[0035] Figure 9 for Figure 1 The diagram shown illustrates the structure of a battery pack when a single cell is connected to a busbar assembly.

[0036] Figure 10 for Figure 9 The diagram shows the structure of a single battery cell;

[0037] Figure 11 for Figure 10 A schematic diagram of the top cover of a single battery cell is shown.

[0038] Figure 12 for Figure 9 The diagram shows a single cell in the battery pack connected to the busbar assembly at another angle.

[0039] Figure 13 for Figure 9 The diagram shows the structure of the insulating component;

[0040] Figure 14 for Figure 2 The diagram shows the structure of the first support.

[0041] Figure 15 for Figure 14 The diagram shows the structure of the first support at another angle;

[0042] Figure 16 for Figure 2 The diagram shows the structure of the acquisition component;

[0043] Figure label:

[0044] 1. Outer shell; 101. Housing; 101a. First through hole; 101b. Second through hole; 101c. Third through hole; 101d. Fourth through hole; 1011. Limiting part; 101e. Housing opening; 102. First end cap; 103. Second end cap;

[0045] 2. Battery cell assembly; 21. Battery cell; 211. Battery cell housing; 2110. Bottom wall; 2111. Top cover; 2111a. Vent; 2112. Peripheral side wall; 214. Explosion relief section; 21a. Gap; 21b. First space;

[0046] 31. First adhesive component; 32. Second adhesive component;

[0047] 4. Bus assembly; 41. First busbar; 411. First bus section; 412. First extension; 413. First connection; 42. Second busbar; 421. Second bus section; 422. Second extension; 423. Second connection;

[0048] 5. Exhaust section; 5a. Passage;

[0049] 6. Insulating component; 61. Base; 61a. First notch; 61b. Second notch; 62. First protrusion;

[0050] 7. Bracket; 701. Main body; 702. First protrusion; 703. Second protrusion; 704. Third protrusion; 705. Fourth protrusion; 706. Fifth protrusion; 70a. First receiving groove; 70b. Second receiving groove; 70c. Third receiving groove; 71. First bracket; 71a. First opening; 71b. Bracket opening; 71c. Third opening; 72. Second bracket; 72a. Second opening;

[0051] 81. First conductive element; 82. Second conductive element;

[0052] 9. Acquisition component; 91. First circuit board; 91a. Fourth opening; 93. Conductive sheet;

[0053] 10. Second circuit board;

[0054] 11. Connectors;

[0055] X, first direction; Y, radial direction of the cell; C, circumferential direction of the cell assembly. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; a connection can be a direct connection or an indirect connection through an intermediate medium, or a connection within two components; a connection can be an electrical connection or an insulating connection.

[0058] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0059] The technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0060] Please see Figures 1 to 16 This application provides a battery pack including a housing 1 and a cell assembly 2. The cell assembly 2 is disposed inside the housing 1.

[0061] In some embodiments, please combine Figure 14 and Figure 15 See also Figures 3 to 6 The battery pack includes a support 7 housed within a housing 101. Exemplarily, the cell assembly 2 is disposed within the support 7.

[0062] In some embodiments, such as Figure 5 or Figure 6 As shown, the battery pack includes multiple first adhesive members 31. The first adhesive members 31 bond the cell assembly 2, the bracket 7, and the housing 1.

[0063] In some embodiments, the first adhesive 31 includes structural adhesive.

[0064] In some embodiments, the first adhesive 31 includes a first colloid. The first colloid may be applied to the side of the cell assembly 2 facing the housing 1, and the first colloid bonds the cell assembly 2 to the housing 1 and the support 7.

[0065] In some embodiments, the first colloid comprises an insulating material. In some embodiments, the insulating material cures naturally to form the first adhesive 31.

[0066] In some embodiments, the battery cell assembly 2 includes N battery cells 21, where N is a natural number greater than 0. Each battery cell 21 includes a bottom wall 2110, a top cover 2111, and a peripheral sidewall 2112 connecting the bottom wall 2110 and the top cover 2111.

[0067] In some embodiments, such as Figure 3 or Figure 4 As shown, N battery cells 21 are arranged along a first direction X. In some embodiments, such as Figure 3 or Figure 4 As shown, the number of the first adhesive component 31 is N.

[0068] In some embodiments, please combine Figures 4 to 6 See also Figure 3 The battery cell assembly 2 is bonded and fixed to the outer casing 1 by N first adhesive pieces 31.

[0069] In the battery pack involved in this application, the cell assembly 2 is bonded and fixed to the bracket 7 and the outer shell 1 by N first adhesive members 31. When the battery pack is under working conditions such as vibration, dynamic, or impact, the N first adhesive members 31 together restrict the movement of the cell assembly 2 relative to the outer shell 1, thereby improving the connection strength and stability between the cell assembly 2 and the outer shell 1.

[0070] In some embodiments, continue as follows Figure 4 As shown, N first adhesive members 31 are spaced apart along the first direction X. Each first adhesive member 31 is independent of the others, further improving the connection strength and stability between the cell assembly 2 and the housing 1.

[0071] In some embodiments, please combine Figure 3 See also Figure 4 N first adhesive pieces 31 and N battery cells 21 are paired one-to-one, and a battery cell 21 is bonded and fixed to the outer shell 1 and the bracket 7 by a first adhesive piece 31.

[0072] In some embodiments, such as Figure 1 , Figure 4 or Figure 8As shown, the outer casing 1 includes a first through-hole 101a. The first through-hole 101a penetrates the casing 101 to communicate with the external environment and the containment space. Exemplarily, the first through-hole 101a is a circular hole.

[0073] In some embodiments, the first through hole 101a is configured to allow insulating material to flow into the space between the housing 101 and the battery cell 21 through the first through hole 101a, and the insulating material is cured to form a first adhesive 31.

[0074] In some embodiments, a portion of the first adhesive member 31 is accommodated in the first through hole 101a. The first adhesive member 31 can close the first through hole 101a to improve the sealing of the battery pack.

[0075] In some embodiments, such as Figure 1 or Figure 4 As shown, the number of first through holes 101a is N.

[0076] In some embodiments, continue as follows Figure 4 As shown, N first through holes 101a are spaced apart along the first direction X.

[0077] In some embodiments, the positions of the N first through holes 101a correspond one-to-one with the positions of the N battery cells 21. Exemplarily, a portion of each first adhesive member 31 is accommodated in each first through hole 101a.

[0078] In some embodiments, please also refer to Figure 4 , Figure 5 and Figure 14 The bracket 7 includes N first openings 71a, each first opening 71a penetrating the bracket 7, and each first opening 71a facing a different first through hole 101a. For example, the first opening 71a is an arc-shaped rectangle.

[0079] In some embodiments, a portion of each peripheral sidewall 2112 faces a different first opening 71a. Each first adhesive member 31 adhesively bonds the housing 1, the bracket 7, and a different battery cell 21, with a portion of each first adhesive member 31 located in a first through hole 101a and facing the first opening 71a. The first adhesive members 31 bond and fix the housing 1, the bracket 7, and the battery cell 21 into a single structure, reducing the use of fasteners, making the battery pack structure more compact, and further improving the connection strength and stability of the battery pack.

[0080] In some embodiments, a portion of the first adhesive 31 is located between the housing 1 and the first bracket 71, and another portion is located between the first bracket 71 and the perimeter sidewall 2112, to reinforce the fixation of the cell assembly 2, the bracket 7, and the housing 1.

[0081] In some embodiments, cell 21 can be a rigid-cased cell or a pouch cell. For example, cell 21 is a rigid-cased cell.

[0082] In some embodiments, the battery cell 21 may be a square battery cell, a cylindrical battery cell, or other irregularly shaped battery cell. For example, the battery cell 21 is a cylindrical battery cell, and examples of such cylindrical battery cells include the 21700 battery cell, the 18650 battery cell, the 46800 battery cell, the 49480 battery cell, or other types of cylindrical battery cells.

[0083] In some embodiments, the first direction X is the axial direction of the cylindrical cell 21.

[0084] In some embodiments, the battery cell 21 is a secondary battery cell. After discharge, the active material of the secondary battery cell can be activated by charging and reused.

[0085] In some embodiments, the battery cell 21 includes a lithium-ion battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, a magnesium-ion battery cell, or other types of battery cells. For example, the battery cell 21 is a lithium-ion battery cell.

[0086] In some embodiments, each battery cell 21 includes a first electrode portion and a second electrode portion disposed opposite to each other, the first electrode portion and the second electrode portion being located on different sides of the battery cell 21. One of the first electrode portion and the second electrode portion is the positive electrode of the battery cell 21, and the other is the negative electrode of the battery cell 21.

[0087] In some embodiments, such as Figure 8 and Figure 9 As shown, the battery cell 21 includes a battery cell housing 211 and electrode terminals (not shown).

[0088] In some embodiments, the cell 21 includes an insulating seal (not shown) at least a portion of which is located between the electrode terminals and the cell housing 211 and insulates the electrode terminals and the cell housing 211.

[0089] In some embodiments, the battery cell 21 includes an electrode assembly (not shown) housed within a battery cell housing 211. The electrode assembly includes a positive electrode (not shown) and a negative electrode (not shown). During the charging and discharging process of the battery cell 21, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrode plates.

[0090] In some embodiments, the battery cell 21 includes a separator disposed between the positive electrode and the negative electrode to insulate the positive electrode and the negative electrode.

[0091] In some embodiments, both the cell housing 211 and the electrode terminals are conductive. Exemplarily, both the cell housing 211 and the electrode terminals are metal, including steel, aluminum, composite metals (such as copper-aluminum alloys), or other conductive metals.

[0092] In some embodiments, one of the positive electrode and the negative electrode is electrically connected to the cell housing 211, and the other is electrically connected to the electrode terminal. In this case, one of the cell housing 211 and the electrode terminal serves as a first electrode portion, and the other serves as a second electrode portion. Exemplarily, the positive electrode is electrically connected to the electrode terminal, which serves as the first electrode portion. The negative electrode is electrically connected to the cell housing 211, which serves as the second electrode portion.

[0093] Alternatively, in some embodiments, the positive electrode is electrically connected to the cell housing 211, which serves as the first electrode portion. The negative electrode is electrically connected to the electrode terminal, which serves as the second electrode portion.

[0094] In some embodiments, see Figures 1 to 4 The outer casing 1 includes a housing 101. The housing 101 has a receiving space (not shown in the figure), in which the battery cell assembly 2 and N first adhesive members 31 are disposed. The N first adhesive members 31 are located between the housing 101 and the battery cell assembly 2, and one first adhesive member 31 is bonded and fixed to a battery cell 21 and part of the inner wall surface of the housing 101.

[0095] In some embodiments, the housing 101 may be a metal housing, a plastic housing, a metal-plastic composite housing, or an outer shell 1 made of other materials. For example, the housing 101 may be a metal housing, which has superior mechanical strength.

[0096] In some embodiments, the housing 101 may be a one-piece molded shell or may be assembled from multiple independently molded parts.

[0097] In some embodiments, such as Figure 3 As shown, the shell 101 is a one-piece molded aluminum cylinder.

[0098] In some embodiments, the housing 101 may be a square shell, a cylindrical shell, or a shell of other shapes. For example, the housing 101 is a cylindrical shell.

[0099] In some embodiments, such as Figure 3 , Figure 5 or Figure 6 As shown, the housing 1 includes a first end cap 102 and a second end cap 103. Along the first direction X, the first end cap 102, the battery cell assembly 2, and the second end cap 103 are arranged sequentially.

[0100] In some embodiments, the first end cap 102 is connected to the housing 101. Exemplarily, both the first end cap 102 and the housing 101 are made of metal, and the first end cap 102 is welded to the housing 101.

[0101] In some embodiments, the second end cap 103 is connected to the housing 101. Exemplarily, both the second end cap 103 and the housing 101 are made of metal, and the second end cap 103 is welded to the housing 101.

[0102] In some embodiments, such as Figure 3 As shown, the housing 101 has housing openings 101e at both ends along the first direction X, and the housing openings 101e are connected to the receiving space. Multiple battery cells 21 are placed in the receiving space. A first end cover 102 covers the housing opening 101e at one end of the housing 101 along the first direction X, and a second end cover 103 covers the housing opening 101e at the other end of the housing 101 along the first direction X.

[0103] In some embodiments, such as Figure 1 , Figure 4 or Figure 8 As shown, the outer casing 1 includes a second through hole 101b, which penetrates the casing 101 to connect the external environment with the containment space. Exemplarily, the second through hole 101b is a circular hole.

[0104] The second through hole 101b is connected to the first through hole 101a through the receiving space. The second through hole 101b can serve as a pressure balance hole, which allows structural adhesive to flow into the gap between the housing 101 and the battery cell assembly 2 through the first through hole 101a.

[0105] In some embodiments, along the radial direction Y of the cell 21, the second through hole 101b and the first through hole 101a are both located on the same side of the housing 101.

[0106] In some embodiments, the second through hole 101b is disposed opposite to the battery cell 21 along the radial direction Y of the battery cell 21. Exemplarily, both the second through hole 101b and the first through hole 101a are disposed opposite to the same battery cell 21 along the radial direction Y of the battery cell 21.

[0107] In some embodiments, continue as follows Figure 1 or Figure 4 As shown, along the first direction X, the first through hole 101a and the second through hole 101b are spaced apart. This allows for continuous venting through the second through hole 101b during the structural adhesive injection process.

[0108] In some embodiments, a portion of the first adhesive member 31 is accommodated in the second through hole 101b. The first adhesive member 31 can seal the second through hole 101b to improve the sealing of the battery pack.

[0109] In some embodiments, such as Figure 1 , Figure 4 or Figure 8 As shown, the diameter of the second through hole 101b is smaller than the diameter of the first through hole 101a. This reduces the amount of structural adhesive that overflows from the housing 101 through the second through hole 101b.

[0110] In some embodiments, the number of second through holes 101b is 2N.

[0111] In some embodiments, such as Figure 1 As shown, 2N second through holes 101b are spaced apart along the first direction X. Exemplarily, the 2N second through holes 101b and N first through holes 101a are all located on the same side of the housing 101.

[0112] In some embodiments, such as Figure 1 , Figure 4 or Figure 8 As shown, along the first direction X, a second through hole 101b is provided on each side of any first through hole 101a. A first through hole 101a and the second through holes 101b located on both sides of the first through hole 101a face the same battery cell 21. During the injection of insulating material, the two second through holes 101b at different positions can serve as combined observation holes to directly observe the filling amount of structural adhesive. When structural adhesive is seen in both second through holes 101b, the injection of insulating material into the first through hole 101a can be stopped.

[0113] In some embodiments, along the first direction X, a second through hole 101b is adjacent to one end of a cell 21, and another second through hole 101b is adjacent to the other end of the same cell 21. This increases the bonding area between the housing 101, the first adhesive 31, and the same cell 21, further improving the connection strength and stability of the battery pack.

[0114] In some embodiments, the distance between two second through holes 101b facing the same cell 21 along the first direction X is L1 mm, and the length of the cell is L2 mm. L1 and L2 satisfy: 1 / 3 ≤ L1 / L2 ≤ 2 / 3. For example, L2 ranges from 40 mm to 75 mm, and L2 can be 40 mm, 42 mm, 45 mm, 48 mm, 50 mm, 52 mm, 54 mm, 56 mm, 58 mm, 60 mm, 65 mm, 70 mm, 75 mm, or any value between two of these.

[0115] The value of L1 is positively correlated with the amount of structural adhesive filling. Within this range, L1 / L2 limits the coverage area of ​​the structural adhesive, reducing the situation where the structural adhesive flows in and blocks the gap between adjacent cells 21. On the other hand, it reduces the situation where a single cell 21 rotates relative to the casing 101 under conditions such as vibration, dynamics, and impact.

[0116] The L1 / L2 ratios that satisfy this condition can be listed as 1 / 3, 1 / 2, 3 / 5, 4 / 7, 5 / 8, or any two of these ratios.

[0117] In some embodiments, such as Figures 9 to 11 As shown, the top cover 2111 serves as the second electrode portion of the battery cell 21. The top cover 2111 includes an exhaust port 2111a that communicates with the external space of the battery cell.

[0118] The battery cell 21 includes a pressure relief section 214. A first space 21b is formed between the top cover 2111 and the pressure relief section 214, and the first space 21b is connected to the exhaust port 2111a. When the battery cell 21 malfunctions, the pressure relief section 214 is activated and forms a pressure relief port. The material inside the battery cell 21 can be discharged to the outside of the battery cell 21 through the pressure relief port, the first space 21b, and the exhaust port 2111a, thereby reducing the risk of the battery cell 21 exploding.

[0119] In some embodiments, when the internal pressure or temperature of the cell 21 reaches a threshold, the explosion relief section 214 performs an action or the weak structure provided in the explosion relief section 214 is destroyed, thereby forming a pressure relief port that can release internal pressure or temperature.

[0120] In some embodiments, N first adhesive members 31 are spaced apart from the exhaust port 2111a to reduce the possibility of the first adhesive being injected into the exhaust port 2111a and blocking the gas flow in the exhaust port 2111a.

[0121] In some embodiments, N first adhesive members 31 are spaced apart from the first space 21b to reduce the possibility of the first adhesive being injected into the first space 21b and blocking the gas flow in the first space 21b.

[0122] In some embodiments, the multiple battery cells 21 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that some of the multiple battery cells 21 are connected in series and others in parallel. For example, the multiple battery cells 21 of the battery cell assembly 2 are connected in series.

[0123] In some embodiments, such as Figure 3 or Figure 4 As shown, two adjacent cells 21 are connected in series. Exemplarily, in two adjacent cells 21, the bottom wall 2110 and the top cover 2111 are both arranged along the first direction X, and the top cover 2111 of one cell 21 is arranged opposite to the first electrode portion of the other cell 21.

[0124] Alternatively, in some embodiments, multiple cells 21 are connected in parallel. Exemplarily, two adjacent cells 21 are connected in parallel along a first direction X. For example, in the first direction X, the bottom walls 2110 of the two cells 21 are positioned opposite each other.

[0125] In some embodiments, the bottom wall 2110 serves as the first electrode portion.

[0126] In some embodiments, please combine Figure 9 and Figure 12 See also Figure 3 The battery pack includes a busbar assembly 4, which connects to adjacent battery cells 21.

[0127] The bus assembly can connect adjacent cells 21 in series or in parallel. For example, along the first direction X, in two adjacent cells 21, the bus assembly 4 is connected to the second electrode portion of one cell 21 and the bus assembly 4 is connected to the first electrode portion of the other cell 21, so that the two adjacent cells 21 are connected in series.

[0128] In some embodiments, the number of busbar components 4 is N-1, and N-1 groups of busbar components 4 are arranged along a first direction X, with one group of busbar components 4 connecting two adjacent battery cells 21. Exemplarily, N-1 groups of busbar components 4 connect multiple battery cells 21 in series.

[0129] In some embodiments, each bus assembly 4 includes a first bus 41 and a second bus 42. In adjacent cells 21, the first bus 41 is connected to one of the cells 21, and the second bus 42 is connected to the other cell 21. Along a first direction X, portions of the first bus 41 and the second bus 42 are located between adjacent cells 21.

[0130] In some embodiments, the second bus 42 is connected to the first electrode portion of one of the battery cells 21, and the first bus 41 is connected to the second electrode portion or the first electrode portion of an adjacent battery cell 21. For example, in two adjacent battery cells 21, the first bus 41 is connected to the bottom wall 2110 of one of the battery cells 21, and the second bus 42 is connected to the top cover 2111 of the other battery cell 21.

[0131] In some embodiments, N first adhesive members 31 and first busbars 41 are spaced apart, and N first adhesive members 31 and second busbars 42 are spaced apart. The first adhesive members 31 and first busbars 41 are not bonded together, and the first adhesive members 31 and second busbars 42 are not bonded together, thereby reducing the impact of the first adhesive members 31 on conductivity.

[0132] For example, such as Figure 9 or Figure 12 As shown, the first busbar 41 includes a first bus section 411. The second busbar 42 includes a second bus section 421. The same battery cell 21 is connected to both the first bus section 411 and the second bus section 421.

[0133] In two adjacent cells 21, the first busbar 411 is connected to the bottom wall 2110 of one of the cells 21, and the second busbar 421 is connected to the top cover 2111 of the other cell 21.

[0134] In some embodiments, the first busbar 411 may be connected to the bottom wall 2110 by welding, bonding, snap-fitting, or other connection methods. For example, the first busbar 411 may be welded to the bottom wall 2110, such as by laser welding.

[0135] In some embodiments, the second busbar 421 may be connected to the top cover 2111 by welding, bonding, snap-fitting, or other connection methods. For example, the second busbar 421 may be welded to the top cover 2111, such as by laser welding.

[0136] In some embodiments, the first busbar 41 and the second busbar 42 may be integrally formed components, or they may be independently formed components. For example, the first busbar 41 and the second busbar 42 are both independently formed components.

[0137] In some embodiments, the first bus 411 and the second bus 421 are directly connected, or other parts of the first bus 41 and other parts of the second bus 42 are connected. Exemplarily, the first bus 411 and the second bus 421 are stacked.

[0138] In some embodiments, such as Figure 9 and Figure 12 As shown, the first busbar 411 is a plate-shaped structure perpendicular to the first direction X, and the second busbar 421 is a plate-shaped structure perpendicular to the first direction X. For example, the first busbar 411 is a circular plate, and the second busbar 421 is a circular plate.

[0139] In some embodiments, the thickness of the first busbar 411 is equal to the thickness of the second busbar 421, so as to reduce the difference between the current carrying capacity of the first busbar 411 and the current carrying capacity of the second busbar 421.

[0140] In some embodiments, such as Figure 12 As shown, the first busbar 41 includes a first extension 412 and a first connection 413. The first extension 412 extends from the first busbar 411. The first connection 413 is located on one side of the battery cell 21 along the radial direction Y of the battery cell 21, and the first connection 413 is connected to the first busbar 411 through the first extension 412.

[0141] For example, the first connecting portion 413 is bent relative to the extension portion 412. Examples of bending angles between the first connecting portion 413 and the first extension portion 412 include 85° to 95°. For example, the first connecting portion 413 is perpendicular to the first extension portion 412.

[0142] In some embodiments, such as Figure 12 As shown, the second busbar 42 includes a second extension 422 and a second connection 423. The second extension 422 extends from the second busbar 421 along the radial direction Y of the battery cell 21. The second connection 423 is located on one side of the battery cell 21 along the radial direction Y, and is connected to the second busbar 421 via the second extension 422.

[0143] For example, the second connecting portion 423 is bent relative to the extension portion. The bending angle between the second connecting portion 423 and the second extension portion 422 is 85° to 95°. For example, the second connecting portion 423 is perpendicular to the second extension portion 422.

[0144] In some embodiments, along the first direction X, the projection of the second extension 422 at least partially overlaps with the projection of the first extension 412, which can increase the flow area of ​​the busbar assembly 4 and reduce heat generation.

[0145] In some embodiments, such as Figure 9 and Figure 12 As shown, the first busbar 411, the first extension 412, and the first connecting portion 413 are integrally formed. The second busbar 421, the second extension 422, and the second connecting portion 423 are integrally formed. The second extension 422 and the second connecting portion 423 are at least partially in contact. The first connecting portion 413 and the second connecting portion 423 are welded together.

[0146] The busbar assembly 4 can be formed by connecting two independently formed first busbars 41 and second busbars 42. After the first busbars 41 and second busbars 42 are respectively connected to the adjacent cells 21, they are then connected by welding, which can simplify the assembly process of the battery pack.

[0147] In some embodiments, please refer to in conjunction with Figures 7 to 11 Along the first direction X, a gap 21a is provided between two adjacent cells 21. For example, along the first direction X, the gap 21a is located between the top cover 2111 of a cell 21 and the bottom wall 2110 of its adjacent cell 21.

[0148] In some embodiments, the explosion relief section 214 is activated and forms a pressure relief port, which relieves pressure through the first space 21b, the exhaust port 2111a and the gap 21a.

[0149] In some embodiments, such as Figure 8 As shown, the battery pack includes a channel 5a. The channel 5a is located between the housing 1 and the support 7. In some embodiments, the gap 21a and the channel 5a are connected.

[0150] In some embodiments, please refer to the following: Figure 6 The bracket 7 includes an exhaust opening 71b that extends through the first bracket 71 and connects the gap 21a and the channel 5a. Exemplarily, the exhaust opening 71b is rectangular.

[0151] In some embodiments, the exhaust opening 71b is opposite to the gap 21a along the radial direction Y of the cell 21, which helps to accelerate the discharge of substances from the cell 21.

[0152] In some embodiments, the gap 21a is connected to the channel 5a through the exhaust opening 71b.

[0153] In some embodiments, for example, the number of exhaust openings 71b and gaps 21a are the same, and the exhaust openings 71b and gaps 21a are provided in a one-to-one correspondence.

[0154] When the explosion vent 214 is activated due to an abnormality in the cell 21 (such as a short circuit, collision or other situation), the material inside the cell 21 is discharged into the gap 21a through the explosion vent 214, and then discharged through the channel 5a, thereby improving the safety of the cell assembly 2.

[0155] In some embodiments, such as Figures 1 to 3 , Figure 5 or Figure 6 As shown, the battery pack includes a vent 5. Optionally, the vent 5 is disposed on the second end cap 103. The vent 5 is configured to discharge gas from the channel 5a.

[0156] In some embodiments, the exhaust section 5 may employ a pressure-sensitive or temperature-sensitive element. When the internal pressure or temperature of the housing 1 reaches a threshold, the exhaust section 5 performs an action or a weak structure provided in the exhaust section 5 is destroyed, thereby forming a pressure relief port for releasing internal pressure or temperature.

[0157] In some embodiments, the vent 5 may be an opening provided on the second end cap 103, the opening penetrating the second end cap 103.

[0158] In some embodiments, the battery pack further includes a protective film (not shown). The protective film is attached to the second end cap 103. The protective film is disposed on the outside of the vent 5 and covers the vent 5.

[0159] For example, the protective membrane includes a waterproof and breathable membrane. When the explosion vent 214 is activated, the substance discharged by the explosion vent 214 can separate at least a portion of the protective membrane and the second end cap 103, and the substance discharged by the explosion vent 214 flows to the outside of the housing 1.

[0160] In some embodiments, the venting section 5 includes a pressure relief valve.

[0161] In some embodiments, M second adhesive members 32 are spaced apart from the channel 5a to reduce the possibility of the second adhesive being injected into the channel 5a and blocking the gas flow in the channel 5a.

[0162] In some embodiments, such as Figure 3 , Figure 7 , Figure 8 , Figure 9 or Figure 12 As shown, the battery pack includes an insulating member 6. Along a first direction X, the insulating member 6 is located between adjacent battery cells 21. In adjacent battery cells 21, a gap 21a is formed between the insulating member 6 and at least one of the battery cells 21.

[0163] There can be one or more insulating elements 6. For example, there are N-1 insulating elements 6, and an insulating element 6 is provided between any two adjacent battery cells 21.

[0164] In some embodiments, such as Figure 13 As shown, the insulating member 6 includes a base 61. Along the first direction X, the base 61 is disposed between adjacent cells 21.

[0165] In some embodiments, in two adjacent cells 21, along the first direction X, the base 61 is disposed between the top cover 2111 of one cell 21 and the bottom wall 2110 of the other cell 21. The insulating member 6 separates the cell housing 211 and the top cover 2111 of the same cell 21, reducing the risk that the bus assembly 4 will short-circuit the first electrode portion and the second electrode portion of the same cell 21.

[0166] In some embodiments, the base 61 is a contoured structure. In two adjacent cells 21, the top cover 2111 of one cell and the bottom wall 2110 of the other cell clamp the base 61, which can improve the stability of the insulation 6 and reduce the risk of the insulation 6 shifting when the battery pack is subjected to external forces.

[0167] In some embodiments, along the first direction X, the projection of the first busbar 411 is separate from the projection of the base 61. The first busbar 411 and the base 61 can share space in the first direction X, thereby improving space utilization and increasing the energy density of the battery pack.

[0168] In some embodiments, along the first direction X, the projection of the second busbar 421 is separate from the projection of the base 61. The second busbar 421 and the base 61 can share space in the first direction X, thereby improving space utilization and increasing the energy density of the battery pack.

[0169] In some embodiments, the base 61 and the adjacent cell 21 are sealed together. Exemplarily, for example, the base 61 and the adjacent cell 21 are bonded together with adhesive. Exemplarily, the adjacent cells 21 are sealed together by a compression insulator 6, which reduces the risk of corrosion at the connection between the first busbar 411 and the top cover 2111, and at the connection between the second busbar 421 and the bottom wall 2110.

[0170] In some embodiments, such as Figure 8 or Figure 9 As shown, the base 61 has a first notch 61a that extends through the base 61 along the radial direction Y of the cell 21. A portion of the first extension 412 is accommodated in the first notch 61a. The first notch 61a can avoid the first extension 412 and the second extension 422, reducing the risk of interference between the first extension 412 and the second extension 422 and the insulating member 6.

[0171] In some embodiments, a portion of the second extension 422 and a portion of the first extension 412 are accommodated in the first notch 61a.

[0172] In some embodiments, such as Figure 8 or Figure 9 As shown, the base 61 has a second notch 61b, which forms a gap 21a with a peripheral sidewall 2112. The first notch 61a and the second notch 61b face the same cell 21. In other embodiments, along the first direction X, the base 61 has a second notch 61b on both sides, and a gap 21a is formed between the base 61 and the adjacent cell 21.

[0173] In some embodiments, such as Figure 13 As shown, the insulating member 6 includes a fifth protrusion 62, which protrudes from the base 61 along the first direction X.

[0174] In some embodiments, the fifth protrusion 62 extends along the circumferential direction C of the base 61. In two adjacent cells 21, the fifth protrusion 62 is located outside the peripheral sidewall 2112 of one of the cells 21, wherein the bottom wall 2110 of the cell 21 is close to the base 61, thereby reinforcing the insulation between adjacent cells 21.

[0175] In some embodiments, the fifth protrusion 62 is compressed, which can improve the seal between the insulation 6 and the cell 21.

[0176] In some embodiments, the fifth protrusion 62 may be one or more. Exemplarily, the fifth protrusion 62 may be one.

[0177] In some embodiments, the cell 21 is a cylindrical cell, and the base 61 is annular. When viewed along the first direction X, the fifth protrusion 62 is arc-shaped.

[0178] In some embodiments, the fifth protrusion 62 is disposed along the edge of the base 61.

[0179] In some embodiments, in two adjacent cells 21, at least a portion of the fifth protrusion 62 is located outside the sidewall of one of the cells 21, and a gap 21a is formed between the base 61 and the cell 21.

[0180] In some embodiments, such as Figure 3 and Figure 6 As shown, the battery pack includes multiple second adhesive members 32. The second adhesive members 32 bond the cell assembly 2, the bracket 7, and the housing 1.

[0181] In some embodiments, the second adhesive 32 includes structural adhesive.

[0182] In some embodiments, the second adhesive 32 includes a second colloid. The second colloid can be applied to the side of the cell assembly 2 facing the housing 1, and the second colloid bonds the cell assembly 2 to the housing 1 and the support 7.

[0183] In some embodiments, the second colloid comprises an insulating material. In some embodiments, the insulating material cures naturally to form the second adhesive 32.

[0184] In some embodiments, the number of second adhesive members 32 is M, where M is a natural number greater than 0.

[0185] In some embodiments, M = N.

[0186] In some embodiments, the cell assembly 2 is bonded and fixed to the housing 1 by M second adhesive members 32. When the battery pack is under operating conditions such as vibration, dynamics, or impact, the M second adhesive members 32 and N first adhesive members 31 together restrict the movement of the cell assembly 2 relative to the housing 1, further improving the connection strength and stability between the cell assembly 2 and the housing 1.

[0187] In some embodiments, such as Figure 5 As shown, M second adhesive members 32 are spaced apart along the first direction X. Each second adhesive member 32 is independent of the others, further improving the connection strength and stability between the cell assembly 2 and the housing 1.

[0188] In some embodiments, along the radial direction Y of the cell 21, M second adhesive members 32 and N cells 21 are positioned opposite each other. For example, a cell 21 is bonded to the housing 1 and the support 7 via a second adhesive member 32.

[0189] In some embodiments, M second adhesives 32 and N first adhesives 31 are spaced apart along the circumferential direction C of the cell assembly.

[0190] In some embodiments, the circumferential direction C of the cell assembly, the radial direction Y of the cell 21, and the first direction X are any two perpendicular to each other.

[0191] In some embodiments, such as Figure 2 As shown, the outer casing 1 includes a third through-hole 101c, which penetrates the casing 101 to connect the external environment with the containment space. Exemplarily, the third through-hole 101c is a circular hole.

[0192] In some embodiments, the third through hole 101c is configured to allow insulating material to flow through the third through hole 101c into the gap between the housing 101 and the battery cell 21, and the insulating material is cured to form a second adhesive 32.

[0193] In some embodiments, the third through hole 101c is disposed opposite to the battery cell 21 along the radial direction Y of the battery cell 21.

[0194] In some embodiments, a portion of the second adhesive 32 is accommodated in the third through-hole 101c. The second adhesive 32 can seal the third through-hole 101c to improve the sealing of the battery pack.

[0195] In some embodiments, the number of third through holes 101c is M.

[0196] In some embodiments, M third through holes 101c are spaced apart along a first direction X.

[0197] In some embodiments, the positions of the M third through holes 101c correspond one-to-one with the positions of the N battery cells 21. For example, a portion of each second adhesive 32 is accommodated in each third through hole 101c, where M = N.

[0198] In some embodiments, continue as follows Figure 2 As shown, the outer casing 1 includes a fourth through hole 101d, which penetrates the casing 101 to communicate with the external environment and the containment space. Exemplarily, the fourth through hole 101d is a circular hole.

[0199] The fourth through hole 101d is connected to the third through hole 101c through the receiving space. The fourth through hole 101d can be used as a pressure balance hole, so that the structural adhesive can flow into the gap 21a between the housing 101 and the battery cell assembly 2 through the third through hole 101c.

[0200] In some embodiments, along the radial direction Y of the cell 21, the fourth through hole 101d and the third through hole 101c are both located on the same side of the housing 101.

[0201] In some embodiments, the fourth through hole 101d and the third through hole 101c are located together on one side of the housing 101, and the second through hole 101b and the first through hole 101a are located together on the other side of the housing 101, wherein the two sides of the housing 101 are different.

[0202] In some embodiments, the fourth through hole 101d is disposed opposite to the battery cell 21 along the radial direction Y of the battery cell 21. Exemplarily, both the fourth through hole 101d and the third through hole 101c are disposed opposite to the same battery cell 21.

[0203] In some embodiments, the fourth through hole 101d and the third through hole 101c are spaced apart along the first direction X. This is to facilitate continuous venting through the third through hole 101c during the structural adhesive injection process.

[0204] In some embodiments, a portion of the second adhesive member 32 is accommodated in the fourth through hole 101d. The second adhesive member 32 can seal the fourth through hole 101d to improve the sealing performance of the battery pack.

[0205] In some embodiments, the diameter of the fourth through hole 101d is smaller than the diameter of the third through hole 101c. This reduces the amount of structural adhesive that overflows from the fourth through hole 101d outside the housing 101.

[0206] In some embodiments, the number of fourth through holes 101d is 2M.

[0207] In some embodiments, 2M fourth through holes 101d are spaced apart along a first direction X. Exemplarily, the 2M fourth through holes 101d and the M first through holes 101a are all located on the same side of the housing 101.

[0208] In some embodiments, such as Figure 2 As shown, along the first direction X, a fourth through hole 101d is provided on each side of any third through hole 101c. A third through hole 101c and the fourth through holes 101d located on both sides of it face the same battery cell 21. During the injection of insulating material, the two fourth through holes 101d at different positions can serve as combined observation holes to directly observe the filling amount of structural adhesive. When structural adhesive is seen in both fourth through holes 101d, the injection of insulating material into the third through hole 101c can be stopped.

[0209] In some embodiments, along the first direction X, a fourth through hole 101d is adjacent to one end of a cell 21, and another fourth through hole 101d is adjacent to the other end of the same cell 21. This increases the bonding area between the housing 101, the second adhesive 32, and the same cell 21, further improving the connection strength and stability of the battery pack.

[0210] In some embodiments, the distance between two fourth through holes facing the same battery cell along the first direction X is L3mm, and the length of the battery cell is L2mm. L3 and L2 satisfy: 1 / 3 ≤ L3 / L2 ≤ 2 / 3. For example, L3 ranges from 40mm to 75mm, and L3 can be 40mm, 42mm, 45mm, 48mm, 50mm, 52mm, 54mm, 56mm, 58mm, 60mm, 65mm, 70mm, 75mm, or any value between two of these.

[0211] In some embodiments, L3 = L1.

[0212] The value of L3 is positively correlated with the amount of structural adhesive filling. Within this range, L3 / L2 limits the coverage area of ​​the structural adhesive, reducing the possibility of structural adhesive flowing in and blocking the gap 21a between adjacent cells 21. On the other hand, it further reduces the possibility of individual cells 21 rotating relative to the casing 101 under conditions such as vibration, dynamics, and impact.

[0213] For L3 / L2 to satisfy this condition, the ranges can be 1 / 3, 1 / 2, 3 / 5, 4 / 7, 5 / 8, or any two of these ratios.

[0214] In some embodiments, see Figure 3 and Figure 6 The bracket 7 includes M second openings 72a, which penetrate the second bracket 72. Each second opening 72a faces a different third through hole 101c. For example, the second opening 72a is an arc-shaped rectangle.

[0215] In some embodiments, a portion of each peripheral sidewall 2112 faces a different first opening 71a. Each second adhesive member 32 adhesively bonds the housing 1, the bracket 7, and a different battery cell 21. A portion of each second adhesive member 32 is located between a third through hole 101c and a second opening 72a facing the third through hole 101c, and a portion is located between the housing 1 and the bracket 7, and a portion is located between the bracket 7 and the peripheral sidewall 2112. The second adhesive members 32 bond and fix the housing 1, the bracket 7, and the battery cell 21 into a single structure, reducing the use of fasteners, making the battery pack structure more compact, and further improving the connection strength and stability of the battery pack.

[0216] In some embodiments, please combine Figure 5 or Figure 6 See also Figure 8The support 7 includes a first receiving groove 70a. The first receiving groove 70a is located on the side of the support 7 away from the battery cell assembly 2. Exemplarily, the support 7 includes a main body portion 701 and a first protrusion 702 and a second protrusion 703 connecting the main body portion 701. A portion of the main body portion 701, the first protrusion 702, and the second protrusion 703 form the first receiving groove 70a. The first receiving groove 70a is located on the side of the first support 71 away from the battery cell assembly 2.

[0217] In some embodiments, the battery pack includes a first conductive element 81. The first conductive element 81 is connected to the cell assembly 2 and is disposed in a first receiving groove 70a. The first receiving groove 70a provides space for the first conductive element 81, thereby improving space utilization and reducing the risk of interference between the first conductive element 81 and the housing 101. When installing the first conductive element 81, the first receiving groove 70a can serve a positioning function, facilitating the assembly of the first conductive element 81.

[0218] In some embodiments, the first conductive element 81 is configured to transmit power to the cell assembly 2. Exemplarily, the first conductive element 81 is connected to the positive terminal of the cell assembly 2. When the battery pack is discharging, the electrical energy of the cell assembly 2 can be transmitted to the load of the electrical device through the first conductive element 81 to power the load. When the battery pack is charging, external electrical energy can be transmitted to the cell assembly 2 through the first conductive element 81 to charge the battery pack.

[0219] In some embodiments, the first conductive element 81 is configured to transmit parameters and / or power of the battery cell assembly 2. Parameters may include at least one of voltage parameters, current parameters, and temperature parameters.

[0220] For example, the first conductive element 81 is a metal element.

[0221] In some embodiments, the channel 5a and the first receiving groove 70a are arranged adjacent to each other along the circumferential direction C of the cell assembly. By using the first protrusion 702 as part of forming the channel 50a, the space utilization inside the battery pack is improved. The channel 5a and the first receiving groove 70a are separated by the first protrusion 702, reducing the interference of substances emitted by the explosion vent 214 on the first conductive element 81.

[0222] In some embodiments, please combine Figure 14 and Figure 15 See also Figure 8 The housing 1 includes a limiting portion 1011. The limiting portion 1011 is provided on the side of the housing 1 facing the cell assembly 2. Exemplarily, the limiting portion 1011 is provided on the side of the housing 101 facing the cell assembly 2.

[0223] In some embodiments, the bracket 7 includes a second receiving groove 70b. The second receiving groove 70b is disposed on the side of the bracket 7 away from the cell assembly 2. Exemplarily, the bracket 7 includes a third protrusion 704 spaced apart from the second protrusion 703. A portion of the main body portion 701, the second protrusion 703, and the third protrusion 704 form the second receiving groove 70b. The second receiving groove 70b is disposed on the side of the first bracket 71 away from the cell assembly 2.

[0224] In some embodiments, the limiting part 1011 is disposed within the second receiving groove 70b. The limiting part 1011 can serve a positioning function, facilitating the assembly of the battery cell assembly 2 and the bracket 7 into an integral structure.

[0225] In some embodiments, the channel 5a, the first conductive element 81, and the limiting part 1011 are sequentially arranged along the circumferential direction C of the cell assembly.

[0226] In some embodiments, please combine Figure 14 and Figure 15 See also Figure 8 The support 7 includes a third receiving groove 70c. The third receiving groove 70c is located on the side of the support 7 away from the cell assembly 2. Exemplarily, along the circumferential direction C of the cell assembly, the support 7 includes a fourth protrusion 705 and a fifth protrusion 706 spaced apart. A portion of the main body 701, the fourth protrusion 705, and the fifth protrusion 705 form the third receiving groove 70c. The third receiving groove 70c is located on the side of the first support 71 away from the cell assembly 2.

[0227] In some embodiments, please combine Figure 3 See also Figure 16 The battery pack includes a data acquisition component 9, which is configured to acquire and transmit parameters of the cell assembly 2. The data acquisition component 9 is connected to the cell assembly 2 and is located in the third receiving slot 70c. The parameters include, but are not limited to, the voltage and temperature of the cell 21.

[0228] In some embodiments, the acquisition component 9 can transmit parameters of the cell assembly 2 to monitor the working status of the cell assembly 2 in real time.

[0229] In some embodiments, the acquisition component 9 is configured to acquire and transmit temperature parameters of the cell assembly 2. Exemplarily, the acquisition component 9 is configured to transmit temperature parameters of at least one cell 21.

[0230] In some embodiments, the acquisition component 9 includes a first circuit board 91 and a temperature sensor (not shown). The temperature sensor is fixed to the side of the first circuit board 91 near the cell assembly 2. Directly fixing the temperature sensor to the first circuit board 91 improves the connection stability of the temperature sensor and mitigates the problem of unstable temperature acquisition.

[0231] In some embodiments, the first circuit board 91 includes a printed circuit board (PCB). Alternatively, in other embodiments, the first circuit board 91 includes a flexible printed circuit board (FPC).

[0232] In some embodiments, the first circuit board 91 is connected to the bracket 7, which improves the connection stability of the first circuit board 91. Exemplarily, the first circuit board 91 is connected to the bracket 7 by welding, snap-fitting, fastener connection, adhesive bonding or other means.

[0233] In some specific implementations, the bracket 7 is provided with a protrusion, which is located in the part of the bracket 7 where the first receiving groove 70a is located. The first circuit board 91 has a through hole, and the protrusion passes through the through hole and is fused together to place the first circuit board 91 in the first receiving groove 70a.

[0234] In some embodiments, the acquisition component 9 is configured to acquire and transmit other types of parameters of the cell assembly 2 besides temperature parameters. Examples of such other types of electrical signals include resistance parameters and current parameters.

[0235] In some embodiments, continue as follows Figure 16 As shown, the acquisition component 9 includes a plurality of conductive sheets 93. The plurality of conductive sheets 93 are spaced apart along a first direction X on the first circuit board 91. Exemplarily, the plurality of conductive sheets 93 are spaced apart along the first direction X on the side of the first circuit board 91 away from the cell assembly 2.

[0236] In some embodiments, the conductive sheet 93 is disposed on the side of the first circuit board 91 opposite to the cell assembly 2.

[0237] In some embodiments, the conductive sheet 93 is configured to collect parameters of the battery cell 21.

[0238] In some embodiments, the first circuit board 91 can collect the voltage of the battery cell 21 through the conductive sheet 93.

[0239] In some embodiments, the number of conductive sheets 93 is the same as the number of busbar components 4, and the conductive parts and busbar components 4 are arranged in a one-to-one correspondence.

[0240] In some embodiments, a plurality of conductive sheets 93 and a plurality of temperature sensors are connected to a first circuit board 91.

[0241] like Figure 3 As shown, in some embodiments, the first circuit board 91 is provided with a fourth opening 91a. A first bus 41 and an adjacent second bus 42 are connected to the same conductive sheet 93 through the same third opening 71c and the same fourth opening 91a.

[0242] In some embodiments, the second connecting portion 423 is disposed between the conductive sheet 93 and the first connecting portion 413. Exemplarily, the conductive sheet 93, the second connecting portion 423, and the first connecting portion 413 are welded together.

[0243] In some embodiments, there are multiple third openings 71c, which are spaced apart along a first direction X. A first extension 412 and a second extension 422 of a busbar assembly 4 pass through the same third opening 71c. Exemplarily, the number of third openings 71c is the same as the number of busbar assemblies 4, and the third openings 71c and busbar assemblies 4 are arranged in a one-to-one correspondence.

[0244] In some embodiments, there are multiple fourth openings 91a, and the multiple fourth openings 91a and the multiple third openings 71c are configured in a one-to-one correspondence.

[0245] In some embodiments, such as Figure 8 As shown, along the circumferential direction C of the battery cell assembly, the channel 5a, the first conductive element 81, the limiting part 1011, and the first circuit board 91 are arranged sequentially. The first protrusion 702, the second protrusion 703, the third protrusion 704, and the fourth protrusion 705 separate the acquisition component 9 from the channel 5a, reducing the interference of the substances emitted by the explosion relief part 214 on the acquisition component 9, which could lead to the failure of the structure and function of the acquisition component 9.

[0246] In some embodiments, the first support 71 includes a third opening 71c, and a first busbar 41 and an adjacent second busbar 42 are connected to the acquisition component 9 through the same notch 61a and the same third opening 71c.

[0247] In some embodiments, the support 7 includes a first support 71 and a second support 72. The cell assembly 2 is disposed between the first support 71 and the second support 72. In other embodiments, the support 7 may be a single, integral structure.

[0248] In some embodiments, N first openings 71a are provided on the first support 71, and the first openings 71 penetrate the first support 71. Along the circumferential direction C of the cell assembly, a fifth protrusion 706 is located between the fourth protrusion 705 and the first openings 71a. The fifth protrusion 706 may restrict the first adhesive 21 from entering the third receiving groove 70c.

[0249] In some embodiments, the fifth protrusion 706 is located on the first bracket 71, where the fourth protrusion 705 is also located.

[0250] In some embodiments, M second openings 72a are provided on the second bracket, and the second openings 72a penetrate the second bracket 72. Along the circumferential direction C of the cell assembly, a fifth protrusion is located between the fourth protrusion and the second opening. The fifth protrusion 706 may restrict the second adhesive 32 from entering the third receiving groove 70c.

[0251] In some embodiments, the first bracket 71 and the second bracket 72 are connected to form a receiving space, and the battery cell assembly 2 is disposed in the receiving space.

[0252] For example, the first bracket 71 and the second bracket 72 can clamp the cell assembly 2 from both sides. When the battery pack is subjected to external force, the first bracket 71 and the second bracket 72 can restrict the movement of the cell assembly 2 within the housing 101, thereby improving the stability and reliability of the battery pack.

[0253] In some embodiments, the first bracket 71 is connected to the second bracket 72. Exemplarily, the first bracket 71 is connected to the second bracket 72 by snap-fit, fastener connection, adhesive or other means.

[0254] In some embodiments, the battery cell 21 is a cylindrical battery cell 21, and both the first support 71 and the second support 72 include arc-shaped walls that can cooperate with the arc-shaped surface of the cylindrical battery cell 21.

[0255] In some embodiments, the first bracket 71 and the second bracket 72 are both insulating brackets 7. The first bracket 71 and the second bracket 72 can separate the cell assembly 2 from the housing 101, thereby reducing the risk of short circuit.

[0256] In some embodiments, the first support 71 and the second support 72 are spaced apart from the first opening 71a at the joint position along the circumferential direction C of the cell assembly. This reduces the possibility of the first colloid seeping from the joint of the first support 71 and the second support 72 into the gap 21a between adjacent cells 21 and affecting the pressure relief of the explosion vent 214.

[0257] In some embodiments, along the circumferential direction C of the cell assembly, the joint position of the first support 71 and the second support 72 are spaced apart from the second opening 72a. This reduces the possibility of the second colloid seeping from the joint of the first support 71 and the second support 72 into the gap 21a between adjacent cells 21, thus affecting the pressure relief of the explosion vent 214.

[0258] In some embodiments, a first protrusion 702 and a second protrusion 703 are disposed on a first bracket 71. A portion of the first bracket 71, the first protrusion 702, and a portion of the housing 1 form a channel 5a. Exemplarily, the channel 5a is defined by a portion of the housing 1, a portion of the first bracket 71, the first protrusion 702, and a portion of the housing 101 abutting against the bracket 7.

[0259] In some embodiments, such as Figure 3 and Figure 5 As shown, the battery pack includes a second circuit board 10, and the cell assembly 2 and the second circuit board 10 are arranged along a first direction X. Exemplarily, the second circuit board 10 can be a printed circuit board or a flexible circuit board. In some embodiments, the acquisition assembly 9 is connected to the second circuit board 10.

[0260] In some embodiments, the second circuit board 10 includes a BMS component. The BMS component includes multiple electronic components that can perform functions such as control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell 21.

[0261] In some embodiments, the battery pack includes a second conductive element 82, and the second conductive element 82 and the second circuit board 10 are arranged sequentially along a first direction X.

[0262] In some embodiments, the second conductive element 82 is connected to the negative terminal of the cell assembly 2, and the first conductive element 81 is connected to the positive terminal of the cell assembly 2. Both the first conductive element 81 and the second conductive element 82 are electrically connected to the second circuit board 10.

[0263] In some embodiments, the battery pack includes a connector 11. The connector 11 passes through the second end cap 103, is exposed outside the second end cap 103, and is electrically connected to the second circuit board 10. The connector 11 is configured to connect to an electrical device.

[0264] According to some embodiments of this application, this application also provides an electrical device that includes at least one battery pack provided in any of the foregoing embodiments. The battery pack can provide electrical energy for the operation of the electrical device.

[0265] The electrical equipment used in the embodiments of this application can be portable devices, laptops, electric toys, drones, power tools, energy storage systems, etc. Power tools include metal cutting power tools, cleaning tools, etc., such as electric drills, electric wrenches, vacuum cleaners, robot vacuum cleaners, electric bicycles, etc. The embodiments of this application do not impose any special limitations on the above-mentioned electrical equipment.

[0266] In some embodiments, the electrical equipment may include an electric-assisted bicycle.

[0267] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A battery pack, characterized in that, include: The outer shell includes N first through holes, where N is a natural number greater than 0; A bracket is disposed within the housing; the bracket includes N first openings, each first opening facing a different first through hole; A battery cell assembly is disposed within the support and includes N battery cells arranged along a first direction; each battery cell includes a bottom wall and a top cover, and a peripheral sidewall connecting the bottom wall and the top cover, with a portion of each peripheral sidewall facing a different first opening; N first adhesive pieces, each first adhesive piece adhesively bonding the housing, the bracket, and a different battery cell, with a portion of each first adhesive piece located in a first through hole and a first opening facing the first through hole.

2. The battery pack according to claim 1, characterized in that, A portion of each of the first adhesive members is located between the housing and the bracket, and another portion is located between the bracket and the peripheral sidewall.

3. The battery pack according to claim 1 or 2, characterized in that, The outer casing includes 2N second through holes, and each of the first through holes is provided with a second through hole on each of its opposite sides along a first direction. A first through hole and the second through holes located on both sides of the first through hole face the same battery cell.

4. The battery pack according to claim 3, characterized in that, Along the first direction, the distance between two second through holes facing the same battery cell is L1 mm, and the length of the battery cell is L2 mm. L1 and L2 satisfy: 1 / 3 ≤ L1 / L2 ≤ 2 / 3.

5. The battery pack according to any one of claims 1-4, characterized in that, The battery cell includes a cylindrical battery cell.

6. The battery pack according to claim 5, characterized in that, Along the first direction, a gap is provided between adjacent battery cells; The battery pack includes an exhaust section and a channel, the exhaust section being disposed in the housing, and the channel being located between the housing and the bracket; The gap and the channel are connected, and the exhaust section is configured to exhaust gas from the channel. The N first adhesive members are spaced apart from the channel.

7. The battery pack according to claim 6, characterized in that, Each battery cell includes a first electrode portion and a second electrode portion, the top cover serves as the second electrode portion of the battery cell, and the top cover includes an exhaust port communicating with the external space of the battery cell; The battery cell includes a venting section, and a first space is formed between the top cover and the venting section, and the first space is connected to the exhaust port; The N first adhesive components and the exhaust port are spaced apart, and the N first adhesive components and the first space are spaced apart.

8. The battery pack according to claim 7, characterized in that, The battery pack includes N-1 busbars, each busbar including a first busbar and a second busbar; along the first direction, portions of the second busbar and the first busbar are located between adjacent cells; The second busbar is connected to the second electrode portion of one of the battery cells, and the first busbar is connected to the first electrode portion or the second electrode portion of an adjacent battery cell; The N first adhesive members and the first busbar are spaced apart, and the N first adhesive members and the second busbar are spaced apart.

9. The battery pack according to claim 8, characterized in that, The battery pack includes a data acquisition component and N-1 insulating components, which are located between adjacent cells. The bracket includes a third opening, the insulating member has a first notch, and a first busbar and a second busbar located between adjacent cells pass through the same first notch and the same third opening and are connected to the acquisition component; The insulating element and at least one battery cell form the gap.

10. The battery pack according to any one of claims 6-9, characterized in that, The bracket includes a first receiving slot, which is located on the side of the bracket away from the battery cell assembly. The bracket includes a main body and a first protrusion and a second protrusion connected to the main body, and a portion of the main body, the first protrusion and the second protrusion form the first receiving groove. The battery pack includes a first conductive element, which is disposed in the first receiving slot and connected to the cell assembly. Along the circumferential direction of the battery cell assembly, the channel is disposed adjacent to the first receiving slot.

11. The battery pack according to claim 10, characterized in that, The outer casing includes a limiting portion. Along the circumferential direction of the battery cell assembly, the bracket includes a third protrusion spaced apart from the second protrusion. A portion of the main body, the second protrusion, and the third protrusion form a second receiving groove, and the limiting portion is disposed in the second receiving groove.

12. The battery pack according to claim 11, characterized in that, Along the circumferential direction of the battery cell assembly, the support includes a fourth protrusion and a fifth protrusion spaced apart, and a portion of the main body, the fourth protrusion, and the fifth protrusion form a third receiving groove; The battery pack includes a data acquisition component, which is at least partially disposed in the third receiving slot, and is configured to acquire and transmit parameters of the battery cell assembly. Along the circumference of the battery cell assembly, the channel, the first conductive element, the limiting part, and the acquisition component are arranged sequentially.

13. The battery pack according to claim 12, characterized in that, The acquisition component includes a first circuit board and a plurality of conductive sheets, the plurality of conductive sheets being disposed on the first circuit board and configured to acquire parameters of the battery cell assembly; Along the circumference of the battery cell assembly, the channel, the first conductive element, the limiting part, and the first circuit board are arranged sequentially.

14. The battery pack according to claim 12 or 13, characterized in that, The support includes a first support and a second support, which are connected to form a receiving space; the battery cell assembly is located within the receiving space. The N first openings are provided on the first bracket along the circumference of the cell assembly, and the fifth protrusion is located between the fourth protrusion and the first opening.

15. The battery pack according to claim 14, characterized in that, The first protrusion and the second protrusion are provided on the first bracket; The channel is formed by a portion of the first bracket, the first protrusion, and a portion of the outer shell.

16. The battery pack according to claim 14 or 15, characterized in that, The outer shell includes M third through holes, where M is a natural number greater than 0; The second bracket includes M second openings; each second opening faces a different third through hole, and a portion of each peripheral sidewall faces a different second opening; The battery pack includes M second adhesive members; each second adhesive member is bonded to the housing, the bracket and a different battery cell, and a portion of each second adhesive member is located in a third through hole and a second opening facing the third through hole, and a portion is located between the housing and the bracket, and a portion is located between the bracket and a peripheral sidewall.

17. An electrical appliance, characterized in that, The electrical equipment includes a battery pack as described in any one of claims 1-16.

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