Battery pack, method of manufacturing the same, and electric device

Abstract

The application relates to the battery technical field and discloses a battery pack, a manufacturing method thereof and a power utilization equipment. The battery pack comprises a support, a battery cell assembly and a collection assembly. The support is provided with a first opening. The battery cell assembly is arranged in the support and comprises a plurality of battery cells. The collection assembly is connected to the battery cell assembly. The collection assembly comprises a first circuit board and a temperature detection piece. The first circuit board is arranged on one side of the support away from the battery cell assembly. The temperature detection piece is fixedly arranged on one side of the first circuit board close to the battery cell assembly and is in thermal connection with at least one battery cell through the first opening.

Description

Technical Field

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

[0002] The maximum temperature of an individual cell and the maximum temperature difference between cells affect the battery pack's performance and lifespan. Therefore, the accuracy of the cell temperature data detected by temperature sensors is crucial. While some battery pack temperature sensors are in contact with the cells, these sensors are relatively prone to loosening, leading to distorted cell temperature data. Summary of the Invention

[0003] The purpose of this application is to provide a battery pack and its manufacturing method, as well as an electrical device, which aims to improve the situation of unstable temperature sensing by the temperature detection element.

[0004] According to a first aspect of this application, a battery pack is provided, comprising a support, a cell assembly, and a data acquisition assembly. The support has a first opening. The cell assembly is disposed within the support and includes a plurality of cells. The data acquisition assembly is connected to the cell assembly. The data acquisition assembly includes a first circuit board and a temperature sensing element. The first circuit board is disposed on the side of the support opposite to the cell assembly. The temperature sensing element is fixed to the side of the first circuit board near the cell assembly, and the temperature sensing element passes through the first opening and is thermally connected to at least one cell.

[0005] In one or more of the above optional embodiments, a plurality of battery cells are arranged along a first direction. The battery cells include cylindrical cells. The first direction is the axial direction of the cylindrical cell. The battery cell includes a cell housing. The cell housing includes a top wall and a bottom wall disposed opposite each other, and a peripheral sidewall connecting the top wall and the bottom wall. A temperature sensing element passes through a first opening and is thermally connected to at least one peripheral sidewall.

[0006] In one or more of the above optional embodiments, the battery pack includes a thermally conductive adhesive. The thermal conductivity of the adhesive is between 0.5 (W / m·K) and 2.5 (W / m·K). The temperature sensing element is bonded to at least one peripheral sidewall via the thermally conductive adhesive.

[0007] In one or more of the above alternative embodiments, the battery cell includes a recess. The recess is located on the peripheral sidewall. Thermally conductive adhesive is located in the recess, and at least a portion of the temperature sensing element is disposed opposite to the recess.

[0008] In one or more of the above optional embodiments, a portion of the peripheral sidewall is recessed to form a recess. The peripheral sidewall includes a first part and a second part. The first part is connected to the top wall, the second part is connected to the bottom wall, and the recess connects the first part and the second part.

[0009] In one or more of the above optional embodiments, a portion of the thermally conductive adhesive is bonded to the recess, and a portion of the thermally conductive adhesive is bonded to the second portion, which is beneficial for the temperature sensing element to detect the cell temperature.

[0010] In one or more of the above optional embodiments, the battery pack includes multiple busbar components. Each busbar component includes a first busbar and a second busbar. Along a first direction, the first busbar and the second busbar are respectively connected to opposite sides of the same battery cell. The data collection component includes multiple conductive sheets. These conductive sheets are disposed on the side of the first circuit board away from the battery cell, and are spaced apart along the first direction. The support includes multiple second openings. The first circuit board has multiple third openings. A first busbar and an adjacent second busbar are connected to the same conductive sheet through the same second opening and the same third opening.

[0011] In one or more of the above optional embodiments, the battery cell includes a battery cell housing, electrode terminals, and an electrode assembly. The electrode assembly is disposed within the battery cell housing. The electrode assembly includes a positive electrode and a negative electrode. One of the positive and negative electrode plates is electrically connected to the electrode terminals, and the other is electrically connected to the battery cell housing. The electrode terminals and the battery cell housing of the same battery cell are respectively connected to a first busbar and a second busbar.

[0012] In one or more of the above optional embodiments, the battery pack includes an insulating member, at least a portion of which is disposed between adjacent battery cells. Along a first direction, at least a portion of the insulating member is disposed between a portion of one of the battery cell housings and a first busbar, wherein the bottom wall of the battery cell is connected to a second busbar.

[0013] In one or more of the above alternative embodiments, the support includes a receiving groove. A first circuit board is located in the receiving groove, and a first opening communicates with the receiving groove.

[0014] 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, within which the battery cell assembly is located. The first 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 a receiving groove.

[0015] In one or more of the above optional embodiments, along the second direction, the first opening penetrates the portion of the main body that forms a receiving groove.

[0016] In one or more of the above optional embodiments, the temperature sensing element includes a first flat surface and a second flat surface disposed opposite to each other. The first flat surface is soldered to the side of the first circuit board near the cell assembly, and the second flat surface is thermally connected to at least one cell.

[0017] In one or more of the above optional embodiments, the first flat surface is soldered to the first circuit board using SMT (Surface Mount Technology) surface mount technology.

[0018] In one or more of the above optional embodiments, the first flat surface is soldered to the first circuit board using SMT (Surface Mount Technology) surface mount technology.

[0019] In one or more of the above optional embodiments, a plurality of battery cells are arranged along a first direction. The battery pack includes a second circuit board. Along the first direction, the second circuit board is disposed at one end of the battery cell assembly, and the second circuit board is electrically connected to the overall positive terminal, the overall negative terminal, and the first circuit board of the battery cell assembly.

[0020] In one or more of the above optional embodiments, the battery pack includes a housing and an adhesive. The support, cell assembly, and data acquisition assembly are all housed within the housing. The adhesive bonds the cell assembly, support, and housing.

[0021] According to a second aspect of this application, an electrical device is provided, including the battery pack described above.

[0022] According to a third aspect of this application, a method for manufacturing the above-mentioned battery pack is provided, comprising the following steps:

[0023] A bracket and a cell assembly are provided, the bracket having a first opening;

[0024] S1: Place the battery cell assembly inside the bracket.

[0025] A data acquisition component is provided, which includes a first circuit board and a temperature sensing element;

[0026] S2: Assemble the first circuit board onto the side of the bracket away from the cell assembly, and thermally connect the temperature sensor through the first opening to at least one cell.

[0027] Before step S2 in one or more of the above optional embodiments, the method further includes:

[0028] Provide thermally conductive adhesive and apply the thermally conductive adhesive to at least one battery cell;

[0029] In the battery pack of this application, the temperature detection element is fixed to the first circuit board, and both the first circuit board and the cell assembly are connected to the bracket. The first circuit board, together with the bracket and the cell assembly, forms an integral structure to jointly cope with impact conditions such as vibration and shock, improving the situation where the temperature detection element is loose relative to the cell and improving the accuracy of the temperature data collected by the temperature detection element.

[0030] 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

[0031] 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.

[0032] Figure 1 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application;

[0033] Figure 2 for Figure 1 The exploded view of the battery pack structure is shown.

[0034] Figure 3 for Figure 1 The diagram shown is a structural schematic of the battery pack without its outer casing.

[0035] Figure 4 for Figure 1 Sectional view along line AA;

[0036] Figure 5 for Figure 4 A magnified view of a portion of point a;

[0037] Figure 6 for Figure 1 The diagram shows the structure of the battery pack's data acquisition components;

[0038] Figure 7 for Figure 6 The diagram shows the structure of the acquisition component at another angle;

[0039] Figure 8 for Figure 7 The diagram shown illustrates the structure of the temperature sensing element.

[0040] Figure 9 for Figure 2 The diagram shows the structure of the first support.

[0041] Figure 10 for Figure 2 The diagram shown illustrates the structure of the busbar assembly when it is assembled into the battery cell.

[0042] Figure 11 for Figure 2 The diagram shown is a structural schematic of the first busbar assembled into the battery cell;

[0043] Figure 12 This is a flowchart of the battery pack manufacturing process.

[0044] Figure label:

[0045] 1. Battery cell assembly; 10. Battery cell; 101. Battery cell housing; 1011. Bottom wall; 1012. Top wall; 1013. Peripheral side wall; 1013a. First part; 1013b. Second part; 102. Electrode terminal; 103. Electrode assembly; 104. Recess;

[0046] 2. Busbar assembly; 21. First busbar component; 211. First busbar section; 212. First extension section; 213. First connecting section; 22. Second busbar component; 221. Second busbar section; 222. Second extension section; 223. Second connecting section;

[0047] 3. Acquisition component; 31. First circuit board; 31a. Third opening; 32. Temperature detection element; 321. First flat surface; 322. Second flat surface; 33. Conductive sheet;

[0048] 4. Thermally conductive adhesive;

[0049] 5. Support; 51. First support; 51a. First opening; 51b. Receiving slot; 51c. Second opening; 511. Main body; 512. First protrusion; 513. Second protrusion; 52. Second support;

[0050] 6. Insulating components;

[0051] 71. Outer shell; 71a. Opening of the outer shell;

[0052] 72. First end cap;

[0053] 73. Second end cap;

[0054] 74. Colloid;

[0055] 8. Second circuit board;

[0056] 91. Main connecting component;

[0057] 92. Main negative connector;

[0058] 93. Connector;

[0059] X, first direction; Y, second direction; Z, circumferential direction of the battery cell. Detailed Implementation

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] Please see Figures 1 to 11 This application provides a battery pack, including a cell assembly 1.

[0065] In some embodiments, such as Figure 2 As shown, the battery cell assembly 1 includes multiple battery cells 10.

[0066] In some embodiments, the battery cell 10 can be a rigid-cased battery cell or a pouch battery cell. For example, the battery cell 10 is a rigid-cased battery cell.

[0067] In some embodiments, the battery cell 10 may be a square battery cell, a cylindrical battery cell, or other irregularly shaped battery cell. For example, the battery cell 10 is a cylindrical battery cell, and examples of such cylindrical battery cells 10 include 21700 cells, 18650 cells, 46800 cells, 49480 cells, or other types of cylindrical battery cells.

[0068] In some embodiments, the battery cell 10 includes, but is not limited to, lithium-ion cells, sodium-lithium-ion cells, sodium-ion cells, magnesium-ion cells, or other types of cells. For example, the battery cell 10 is a lithium-ion cell.

[0069] In some embodiments, the battery cell 10 is a secondary battery cell. After discharge, the active material in the secondary battery cell can be activated by charging and reused.

[0070] In some embodiments, such as Figure 10 or Figure 11As shown, the battery cell 10 includes a battery cell housing 101 and electrode terminals 102. The battery cell 10 includes an insulating seal (not shown), at least a portion of which is located between the electrode terminals 102 and the battery cell housing 101, and insulates the electrode terminals 102 and the battery cell housing 101.

[0071] In some embodiments, please combine Figure 10 and Figure 11 See also Figure 4 The battery cell 10 includes an electrode assembly 103, which is housed within a battery cell housing (101). The electrode assembly 103 includes a positive electrode (not shown) and a negative electrode (not shown). During the charging and discharging process of the battery cell 10, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive and negative electrode.

[0072] In some embodiments, the battery cell 10 includes a separator (not shown) disposed between the positive electrode and the negative electrode to insulate the positive electrode and the negative electrode.

[0073] In some embodiments, both the cell housing 101 and the electrode terminals 102 are conductive. Exemplarily, both the cell housing 101 and the electrode terminals 102 comprise metal, such as steel, aluminum, composite metals (e.g., copper-aluminum alloys) or other conductive metals.

[0074] In some embodiments, one of the positive electrode and the negative electrode is electrically connected to the cell housing 101, and the other is electrically connected to the electrode terminal 102. In this case, the cell housing 101 serves as one electrical connection terminal of the cell 10, and the electrode terminal 102 serves as the other electrical connection terminal of the cell 10. Exemplarily, the positive electrode is electrically connected to the electrode terminal 102, which serves as the positive electrical connection terminal of the cell 10, and the negative electrode is electrically connected to the cell housing 101, which serves as the negative electrical connection terminal of the cell 10.

[0075] In other embodiments, the positive electrode is electrically connected to the cell housing 101, which serves as the positive electrical connection terminal of the cell 10. The negative electrode is electrically connected to the electrode terminal 102, which serves as the negative electrical connection terminal of the cell 10.

[0076] In some embodiments, such as Figure 10 and Figure 11 As shown, the battery cell housing 101 includes a bottom wall 1011 and a top wall 1012 disposed opposite to each other along a first direction X, and a peripheral side wall 1013 connecting the bottom wall 1011 and the top wall 1012.

[0077] In some embodiments, such as Figures 2 to 4As shown, multiple battery cells 10 are arranged along a first direction X. Exemplarily, the multiple battery cells 10 are arranged along the first direction X to form a columnar structure. The first direction X is the axial direction of the battery cells 10.

[0078] In some embodiments, the plurality of battery cells 10 may be connected in series, in parallel, or in a mixed manner, wherein a mixed manner means that some of the plurality of battery cells 10 are connected in series and in parallel. For example, the plurality of battery cells 10 are connected in series.

[0079] In some embodiments, such as Figure 5 As shown, two adjacent cells 10 are connected in series along the first direction X. Exemplarily, in two adjacent cells 10, the bottom wall 1011 and the top wall 1012 are both arranged along the first direction X; the top wall 1012 of one cell 10 is arranged opposite to the bottom wall 1011 of the other cell 10.

[0080] Alternatively, in some embodiments, multiple cells 10 are connected in parallel. For example, two adjacent cells 10 are connected in parallel along a first direction X. For instance, in the first direction X, the bottom walls 1011 of the two cells 10 are positioned opposite each other.

[0081] In some embodiments, continue as follows Figure 2 As shown, the battery pack includes multiple busbar components 2. The multiple busbar components 2 are arranged along a first direction X, and one busbar component 2 connects to an adjacent battery cell 10.

[0082] In some embodiments, adjacent cells 10 are connected in series via a busbar assembly 2, or adjacent cells 10 are connected in parallel via a busbar assembly 2. Exemplarily, along the first direction X, the busbar assembly 2 is connected to the electrode terminal 102 of one cell 10 and the top wall 1012 of another cell 10, thereby realizing the series connection of adjacent cells 10.

[0083] In some embodiments, such as Figure 10 and Figure 11 As shown, the bus assembly 2 includes a first bus 21 and a second bus 22. Along the first direction X, the first bus 21 and the second bus 22 are respectively connected to both sides of the same battery cell 10. Along the first direction X, the interconnected first bus 21 and second bus 22 are located between two adjacent battery cells 10. In two adjacent battery cells 10, the first bus 21 is connected to the electrode terminal 102 of one battery cell 10, and the second bus 22 is connected to the top wall 1012 of the other battery cell 10.

[0084] For example, the first busbar 21 includes a first busbar portion 211. The second busbar 22 includes a second busbar portion 221. The electrode terminals 102 of the same battery cell 10 are respectively connected to a first busbar 21 and a second busbar 2. In two adjacent battery cells 10, the first busbar portion 211 is connected to the electrode terminal 102 of one of the battery cells 10, and the second busbar portion 221 is connected to the top wall 1012 of the other battery cell 10.

[0085] In some embodiments, the first busbar 211 may be connected to the bottom wall 1011 by welding, bonding, snap-fitting, or other connection methods. For example, the first busbar 211 may be welded to the top wall of the electrode terminal 102, such as by laser welding.

[0086] In some embodiments, the second busbar 221 may be connected to the top wall 1012 by welding, bonding, snap-fitting, or other connection methods. For example, the second busbar 221 may be welded to the top wall 1012, such as by laser welding.

[0087] In some embodiments, the first busbar 21 and the second busbar 22 may be integrally formed components, or they may be independently formed components. For example, the first busbar 21 and the second busbar 22 are both independently formed components.

[0088] In some embodiments, the first bus 211 and the second bus 221 are directly connected, or other parts of the first bus 21 and other parts of the second bus 22 are connected. Exemplarily, the first bus 211 and the second bus 221 are stacked.

[0089] In some embodiments, such as Figure 10 As shown, the first busbar 211 is a plate-shaped structure perpendicular to the first direction X, and the second busbar 221 is a plate-shaped structure perpendicular to the first direction X. For example, the first busbar 211 is a circular plate, and the second busbar 221 is a circular plate.

[0090] In some embodiments, the thickness of the first busbar 211 is equal to the thickness of the second busbar 221, so as to reduce the difference between the current carrying capacity of the first busbar 211 and the current carrying capacity of the second busbar 221.

[0091] In some embodiments, such as Figure 11 As shown, the first busbar 21 includes a first extension 212 and a first connection 213. The first extension 212 extends from the first busbar 211. The first connection 213 is located on one side of the battery cell 10 along the second direction Y, where the second direction Y is the radial direction of the battery cell 10.

[0092] For example, the first connecting portion 213 is bent relative to the first extension portion 222. For example, the bending angle can be 85° to 95°. As an example, the first connecting portion 213 is perpendicular to the first extension portion 222.

[0093] In some embodiments, such as Figure 10 As shown, the second busbar 22 includes a second extension 222 and a second connection 223. The second extension 222 extends from the second busbar 221. The second connection 223 is located on one side of the battery cell 10 along the second direction Y.

[0094] For example, the second connecting portion 223 is bent relative to the second extension portion 222. For example, the bending angle is 85° to 95°. As an example, the first connecting portion 213 is perpendicular to the first extension portion 222.

[0095] In some embodiments, such as Figure 5 As shown, along the first direction X, the projection of the second extension 222 at least partially overlaps with the projection of the first extension 222, which can increase the flow area of ​​the busbar assembly 2 and reduce heat generation.

[0096] In some embodiments, such as Figure 10 and Figure 11 As shown, the first busbar 211, the first extension 222, and the first connecting portion 213 are integrally formed. The second busbar 221, the second extension 222, and the second connecting portion 223 are integrally formed. The second extension 222 and the second connecting portion 223 are at least partially in contact. The first connecting portion 213 and the second connecting portion 223 are welded together.

[0097] The current collector assembly 2 can be formed by connecting two independently formed first current collector 21 and second current collector 22. After the first current collector 21 and second current collector 22 are respectively connected to the adjacent battery cell 10, they are then connected by welding, which can simplify the assembly process of the battery pack.

[0098] In some embodiments, the battery pack includes a data acquisition component 3. The data acquisition component 3 is connected to the cell assembly 1.

[0099] In some embodiments, the acquisition component 3 can transmit electrical signals of the cell assembly 1 to monitor the working status of the cell assembly 1 in real time.

[0100] In some embodiments, the acquisition component 3 is configured to transmit a temperature signal of the battery cell assembly 1. Exemplarily, the acquisition component 3 is configured to transmit a temperature signal of at least one battery cell 10.

[0101] In some embodiments, please combine Figure 7 See also Figure 4 and Figure 5The data acquisition component 3 includes a first circuit board 31 and a temperature sensor 32. The temperature sensor 32 is fixed to the side of the first circuit board 31 near the cell assembly 1. The direct fixing of the temperature sensor 32 to the first circuit board 31 improves the connection stability of the temperature sensor 32 and alleviates the problem of unstable temperature sensing by the temperature sensor 32.

[0102] In some embodiments, the temperature sensing element 32 is thermally connected to at least one battery cell 10. Thermal connection means that heat can be transferred between the temperature sensing element 32 and the at least one battery cell 10. The thermal connection can be a direct contact connection between the temperature sensing element 32 and the at least one battery cell 10, or it can be a connection between the temperature sensing element 32 and the at least one battery cell 10 via a thermally conductive medium. The thermally conductive medium includes, but is not limited to, thermally conductive adhesive 4.

[0103] In some embodiments, the temperature sensor 32 is used to collect information about the battery cell 10. For example, the temperature sensor 32 is used to collect the temperature of the battery cell 10.

[0104] In some embodiments, the first circuit board 31 includes a printed circuit board (PCB). Alternatively, in other embodiments, the first circuit board 31 includes a flexible printed circuit board (FPC).

[0105] In some embodiments, please combine Figure 8 See also Figure 5 The temperature sensing element 32 includes a first flat surface 321 and a second flat surface 322. The first flat surface 321 and the second flat surface 322 are disposed opposite to each other. The first flat surface 321 is soldered to the first circuit board 31. The second flat surface 322 is thermally connected to at least one battery cell 10.

[0106] For example, the temperature sensing element 32 includes an NTC (Negative Temperature Coefficient) chip. The first flat surface 321 is soldered to the first circuit board 31 using SMT (Surface Mount Technology). The first circuit board 31 can transmit the temperature signal detected by the NTC chip from the cell 10 to other components of the battery pack.

[0107] Alternatively, in other embodiments, the NTC chip may also be packaged as a packaged element, which is then soldered to the first circuit board 31 after being inserted into the socket of the first circuit board 31 via DIP pins.

[0108] Alternatively, in some embodiments, the temperature sensing element 32 includes a PTC (Positive Temperature Coefficient) chip. The PTC chip can also be mounted on the side of the first circuit board 31 near the cell assembly 1 via SMT or DIP.

[0109] In some embodiments, the temperature sensing element 32 may be one or more.

[0110] For example, there are multiple temperature sensors 32, and some of the multiple temperature sensors 32 are electrically connected to the battery cell assembly 1 through the first circuit board 31. Alternatively, each temperature sensor 32 is electrically connected to the battery cell assembly 1 through the first circuit board 31, and one temperature sensor 32 passes through a first opening 51a and is thermally connected to a battery cell 10, so that the acquisition component 3 can acquire the overall temperature of the battery cell assembly 1.

[0111] The number and placement of multiple temperature sensors 32 can be flexibly adjusted according to the differences in temperature field distribution of the battery cell assembly 1, which can improve the accuracy of temperature acquisition by the acquisition component 3 while reducing the redundancy of temperature acquisition by the acquisition component 3.

[0112] In some embodiments, please continue to see Figure 4 The battery pack includes thermally conductive adhesive 4. The temperature sensing element 32 is bonded and fixed to at least one peripheral sidewall 1013 by the thermally conductive adhesive 4.

[0113] In some embodiments, under standard conditions (25°C), the thermal conductivity of the thermally conductive adhesive 4 is 0.5 W / (m·K) to 2.5 W / (m·K). The heat generated during the charging and discharging of at least one battery cell 10 can be rapidly transferred to the temperature sensing element 32, improving the efficiency of heat transfer. For example, the thermal conductivity of the thermally conductive adhesive 4 can be 0.5 W / (m·K), 0.8 W / (m·K), 1 W / (m·K), 1.2 W / (m·K), 1.5 W / (m·K), 1.8 W / (m·K), 2 W / (m·K), 2.3 W / (m·K), 2.5 W / (m·K), or a range consisting of any two values ​​within this range.

[0114] Materials used to manufacture such thermally conductive adhesive 4 include at least one of polyurethane, epoxy resin, polybutadiene rubber, and silicone. For example, the thermally conductive adhesive 4 is silicone, which has good electrical insulation properties and can improve the electrical safety between the battery cell assembly 1 and the acquisition assembly 3.

[0115] In some embodiments, the number of thermally conductive adhesives 4 is the same as the number of temperature sensing elements 32, and the temperature sensing elements 32 and thermally conductive adhesives 4 are arranged in a one-to-one correspondence.

[0116] The battery cell 10 includes a recess 104 disposed on the peripheral sidewall 1013. At least a portion of the temperature sensing element 32 is disposed opposite to the recess 104.

[0117] In some embodiments, such as Figure 5 As shown, a portion of the peripheral sidewall 1013 is recessed to form a recess 104. The peripheral sidewall 1013 includes a first portion 1013a and a second portion 1013b. The first portion 1013a is connected to the bottom wall 1011, and the second portion 1013b is connected to the top wall 1012. The recess 104 connects the first portion 1013a and the second portion 1013b.

[0118] In some embodiments, such as Figure 5 As shown, part of the thermally conductive adhesive 4 is bonded to the recess 104, and part of the thermally conductive adhesive 4 is bonded to the second part 1013b, which is beneficial for the temperature sensing element 32 to detect the temperature of the battery cell 10.

[0119] In some embodiments, the thermally conductive adhesive 4 is located in the recess 104, and the temperature sensing element 32 is bonded to the recess 104 via the thermally conductive adhesive 4. On the one hand, when the thermally conductive adhesive 4 is not cured, it can be confined within the recess 104, reducing leakage. On the other hand, the large contact area between the thermally conductive adhesive 4 and the recess 104 facilitates bonding and also improves the accuracy of temperature sensing by the temperature sensing element 32.

[0120] In some embodiments, the thermally conductive adhesive 4 cures naturally.

[0121] In some embodiments, the thermal conductivity of the thermally conductive adhesive 4 is greater than that of air, further improving the efficiency of heat transfer.

[0122] In some embodiments, such as Figure 2 , Figure 3 as well as Figure 5 As shown, the battery pack includes a support 5. Exemplarily, the support 5 can be used to support the cell assembly 1.

[0123] In some embodiments, the support 5 forms a receiving space, and the battery cell assembly 1 is disposed within the receiving space.

[0124] In some embodiments, the bracket 5 has a first opening 51a that extends through the bracket 5. The temperature sensing element 32 passes through the first opening 51a and is thermally connected to at least one battery cell 10.

[0125] In some embodiments, please combine Figure 9 See also Figure 5 The temperature sensing element 32 passes through the first opening 51a and is thermally connected to at least one peripheral sidewall 1013.

[0126] In this application's battery pack, the temperature detection element 32 is fixed to the first circuit board 31, and both the first circuit board 31 and the cell assembly 1 are connected to the bracket 5. The first circuit board 31, together with the bracket 5 and the cell assembly 1, forms an integral structure to jointly cope with impact conditions such as vibration and shock, improving the situation where the temperature detection element 32 is loose relative to the cell 10, and improving the accuracy of the temperature data collected by the temperature detection element 32 from the cell 10.

[0127] In some embodiments, the number of first openings 51a is the same as the number of temperature sensing elements 32, and a temperature sensing element 32 passes through a first opening 51a and is thermally connected to at least one battery cell 10. Exemplarily, a temperature sensing element 32 passes through a first opening 51a and is bonded to a battery cell 10 using a thermally conductive adhesive 4.

[0128] In some specific implementation methods, please continue to combine Figure 9 See also Figure 4 The number of temperature detection elements 32 and the number of first openings 51a are four each.

[0129] Along the first direction X, a temperature sensing element 32 is located near one end of the cell assembly 1. This temperature sensing element 32 passes through the first opening 51a corresponding to its position and is thermally connected to a cell 10.

[0130] Along the first direction X, another temperature sensing element 32 is located near the other end of the cell assembly 1. This temperature sensing element 32 passes through the first opening 51a corresponding to its position and is thermally connected to another cell 10.

[0131] Along the first direction X, the other two temperature detection elements 32 correspond to the two battery cells 10 located in the middle of the battery cell assembly 1, and each temperature detection element 32 passes through the first opening 51a corresponding to its position and is thermally connected to the other battery cell 10.

[0132] In some embodiments, please combine Figure 3 See also Figure 9 The bracket 5 has a receiving groove 51b on the side opposite to the battery cell assembly 1, and the first circuit board 31 is located in the receiving groove 51b. The first opening 51a is connected to the receiving groove 51b.

[0133] In some embodiments, the first circuit board 31 is connected to the bracket 5, which improves the connection stability of the first circuit board 31. Exemplarily, the first circuit board 31 is connected to the bracket 5 by welding, snap-fitting, fastener connection, adhesive bonding or other means.

[0134] In some specific implementations, the bracket 5 is provided with a protrusion, which is located in the part of the bracket 5 where the receiving groove 51b is located. The first circuit board 31 has a through hole, and the protrusion passes through the through hole and is fused together to place the first circuit board 31 in the receiving groove 51b.

[0135] In some embodiments, the first opening 51a is connected to the receiving groove 51b, so that the temperature sensing element 32 can pass through the first opening 51a.

[0136] In some embodiments, such as Figure 2 and Figure 3 As shown, the support 5 includes a first support 51 and a second support 52. The first support 51 and the second support 52 are connected to form a receiving space (not shown in the figure).

[0137] In some embodiments, the cell assembly 1 is disposed between the first bracket 51 and the second bracket 52. The first bracket 51 and the second bracket 52 can clamp the cell assembly 1 from both sides. When the battery pack is under impact conditions, the first bracket 51 and the second bracket 52 can restrict the movement of the cell assembly 1, improve the stability of the connection between the acquisition component 3 and the cell 10, reduce the risk of open circuit, and improve the stability and reliability of the battery pack.

[0138] In some embodiments, the first bracket 51 is connected to the second bracket 52. Exemplarily, the first bracket 51 is connected to the second bracket 52 by splicing, snap-fitting, fastener connection, adhesive bonding or other means.

[0139] In some specific implementations, one of the first bracket 51 and the second bracket 52 is provided with a protrusion, and the other is provided with a notch that matches the protrusion. The protrusion is embedded in the notch to splice the first bracket 51 and the second bracket 52 together.

[0140] In some embodiments, the battery cell 10 is a cylindrical battery cell 10, and both the first support 51 and the second support 52 include arc-shaped walls that can cooperate with the arc-shaped peripheral sidewall 1013 of the cylindrical battery cell 10.

[0141] In some embodiments, the first bracket 51 and the second bracket 52 are both insulating brackets 5, which can separate the battery cell assembly 1 and the first circuit board 31, thereby improving the electrical safety between the two.

[0142] In some embodiments, such as Figure 9 As shown, the first opening 51a penetrates the first support 51.

[0143] In some embodiments, such as Figure 9 As shown, a receiving groove 51b is formed on the side of the first bracket 51 facing away from the cell assembly 1. Exemplarily, the first bracket 51 includes a main body portion 511, a first protrusion 512, and a second protrusion 513. Along the circumferential direction Z of the cell 10, the first protrusion 512 and the second protrusion 513 are spaced apart on the side of the main body portion 511 facing away from the cell assembly 1, and the first protrusion 512, the second protrusion 513, and the main body portion 511 surround to form the receiving groove 51b, and the first circuit board 31 is located in the receiving groove 51b.

[0144] In some embodiments, along the second direction Y, the first opening 51a penetrates the portion of the main body 510 that forms the receiving groove 51b.

[0145] In some embodiments, the acquisition component 3 is configured to transmit electrical signals of the cell assembly 1 other than temperature signals, such as voltage signals, resistance signals, and current signals.

[0146] In some embodiments, such as Figure 2 , Figure 4 , Figure 5 as well as Figure 6 As shown, the acquisition component 3 includes a plurality of conductive sheets 33. The plurality of conductive sheets 33 are spaced apart along a first direction X on the first circuit board 31. Exemplarily, the plurality of conductive sheets 33 are spaced apart along the first direction X on the side of the first circuit board 31 away from the cell assembly 1.

[0147] In some embodiments, the conductive sheet 33 is configured to collect electrical signal information of the battery cell 10.

[0148] In some embodiments, the first circuit board 31 can collect the voltage of the battery cell 10 through the conductive sheet 33.

[0149] In some embodiments, the number of conductive sheets 33 is the same as the number of busbar components 2, and the conductive parts and busbar components 2 are arranged in a one-to-one correspondence.

[0150] In some embodiments, a plurality of conductive sheets 33 and a plurality of temperature sensing elements 32 are connected to a first circuit board 31.

[0151] In some embodiments, please combine Figure 2 See also Figure 5 The conductive sheet 33 is disposed on the side of the first bracket 51 away from the battery cell assembly 1, and the first connecting part 213 is disposed on the side of the conductive sheet 33 away from the first bracket 51.

[0152] In some embodiments, the first support 51 includes a second opening 51c, and the first circuit board 31 has a third opening 31a. A first bus 21 and an adjacent second bus 22 are connected to the same conductive sheet 33 through the same second opening 51c and the same third opening 31a.

[0153] In some embodiments, please combine Figure 2 See also Figure 5The first extension 222 and the second extension 222 pass through the second opening 51c. The first extension 222 and the second extension 222 pass through the third opening 31a. By providing the third opening 31a, the first extension 222 and the second extension 222 can pass through the first circuit board 31, thereby realizing the connection of the conductive sheet 33, the first connecting part 213, the second connecting part 223, the first busbar 211, and the second busbar 221.

[0154] In some embodiments, the second connecting portion 223 is disposed between the conductive sheet 33 and the first connecting portion 213. Exemplarily, the conductive sheet 33, the second connecting portion 223, and the first connecting portion 213 are welded together. Optionally, the conductive sheet 33, the second connecting portion 223, and the first connecting portion 213 are stacked together.

[0155] In some embodiments, there are multiple second openings 51c, and the multiple second openings 51c are spaced apart along the first direction X. For example, the number of second openings 51c is the same as the number of busbar components 2, and the second openings 51c and busbar components 2 are arranged in a one-to-one correspondence.

[0156] In some embodiments, there are multiple third openings 31a, and the multiple third openings 31a and the multiple second openings 51c are configured in a one-to-one correspondence.

[0157] In some embodiments, please combine Figure 2 See also Figure 5 The battery pack includes an insulator 6, at least a portion of which is disposed between adjacent cells 10. Along a first direction X, at least a portion of the insulator 6 is disposed between one of the cell housings 101 and a first extension 222, wherein the bottom and top walls 1012 of the cell 10 are connected to a second busbar 221. The insulator 6 separates the first extension 222 from the cell housing 101, reducing the risk of the busbar assembly 2 short-circuiting the positive and negative terminals of the same cell 10.

[0158] In some embodiments, the insulating member 6 has a contoured structure. Along the first direction X, at least a portion of the insulating member 6 is clamped between two adjacent battery cells 10.

[0159] In some embodiments, along the first direction X, the projection of the first busbar 211 is separate from the projection of the insulator 6. The first busbar 211 and the insulator 6 can share space in the first direction X, thereby improving space utilization and increasing the energy density of the battery pack.

[0160] In some embodiments, along the first direction X, the projection of the second busbar 221 is separate from the projection of the insulator 6. The second busbar 221 and the insulator 6 can share space in the first direction X, thereby improving space utilization and increasing the energy density of the battery pack.

[0161] In some embodiments, the insulating member 6 and the adjacent battery cell 10 are sealed together. Exemplarily, for example, the insulating member 6 and the adjacent battery cell 10 are bonded together with adhesive. Exemplarily, the gap between the insulating member 6 and the adjacent battery cell 10 is reduced by compressing the insulating member 6. The sealed connection between the insulating member 6 and the battery cell 10 reduces the risk of corrosion at the connection between the first busbar 211 and the bottom wall 1011, and the risk of corrosion at the connection between the second busbar 221 and the top wall 1012.

[0162] In some embodiments, the insulating member 6 is provided with a channel extending through the insulating member 6 in a second direction Y. A portion of the first extension 222 is accommodated in the channel. The channel can avoid the first extension 222, reducing the risk of interference between the first extension 222 and the insulating member 6.

[0163] In some embodiments, a portion of the second extension 222 and a portion of the first extension 222 are accommodated in the channel.

[0164] In some embodiments, such as Figure 1 , Figure 2 as well as Figure 4 As shown, the battery pack includes a housing 71. The cell assembly 1, the data acquisition assembly 3, and the current collector assembly 2 are all housed within the housing 71.

[0165] In some embodiments, the outer shell 71 may be a square shell, a cylindrical shell, or a shell of other shapes. As an example, the outer shell 71 is a cylindrical shell.

[0166] In some embodiments, the housing 71 may be a metal housing, a plastic housing, a metal-plastic composite housing, or a housing 71 made of other materials. As an example, the housing 71 is a metal housing, which has better mechanical strength.

[0167] In some embodiments, the housing 71 may be a one-piece molded housing 71, or it may be composed of multiple independently molded parts spliced ​​together.

[0168] In some embodiments, such as Figures 1 to 4 As shown, the battery pack includes a first end cover 72 and a second end cover 73. Along the first direction X, the first end cover 72, the cell assembly 1, and the second end cover 73 are arranged sequentially.

[0169] In some embodiments, the first end cap 72 is attached to the housing 71. Exemplarily, both the first end cap 72 and the housing 71 are made of metal, and the first end cap 72 is welded to the housing 71.

[0170] In some embodiments, the second end cap 73 is attached to the housing 71. Exemplarily, both the second end cap 73 and the housing 71 are made of metal, and the second end cap 73 is welded to the housing 71.

[0171] In some embodiments, the outer casing 71 is an aluminum cylinder.

[0172] In some embodiments, such as Figure 2 As shown, the outer casing 71 has outer casing openings 71a at both ends along the first direction X. The overall structure of the battery cell assembly 1, the bracket 5 and the acquisition assembly 3 can be installed into the outer casing 71 through the outer casing openings. After the bracket 5 is installed in place, the first end cover 72 and the second end cover 73 respectively cover the outer casing openings 71a.

[0173] In some embodiments, such as Figure 2 or Figure 3 As shown, the cell assembly 1 is bonded to the first bracket 51 and / or the second bracket 52, and the housing 71 is bonded to the first bracket 51 and / or the second bracket 52. Bonding the cell assembly 1 and the housing 71 to at least one of the first bracket 51 and the second bracket 52 can restrict the movement of the cell assembly 1 within the housing 71 when the battery is subjected to impact conditions such as vibration and shock, thereby improving the stability and reliability of the battery pack.

[0174] In some embodiments, an adhesive 74 may be applied to the side of the first bracket 51 facing the cell assembly 1, and the adhesive 74 may bond the cell assembly 1 and the housing 71 to the first bracket 51. Exemplarily, each cell 10 and the housing 71 are bonded to the first bracket 51 by the adhesive 74.

[0175] In some embodiments, an adhesive 74 may be applied to the side of the second bracket 52 facing the cell assembly 1, and the adhesive 74 may bond the cell assembly 1 and the housing 71 to the second bracket 52. Exemplarily, each cell 10 and the housing 71 are bonded to the second bracket 52 by the adhesive 74.

[0176] In some embodiments, see Figures 2 to 4 The battery pack includes a second circuit board 8, and the cell assembly 1 and the second circuit board 8 are arranged along a first direction X. Exemplarily, the second circuit board 8 can be a printed circuit board or a flexible circuit board. In some embodiments, the acquisition assembly 3 is connected to the second circuit board 8.

[0177] In some embodiments, the second circuit board 8 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 10.

[0178] In some embodiments, such as Figure 2 As shown, the battery pack includes a main positive connector 91 and a main negative connector 92. Along the first direction X, the main negative connector 92 and the second circuit board 8 are arranged sequentially.

[0179] In some embodiments, the total negative connector 92 is connected to the total negative terminal of the cell assembly 1, and the total positive connector 91 is connected to the total positive terminal of the cell assembly 1. Both the total positive connector 91 and the total negative connector 92 are connected to the second circuit board 8.

[0180] In some embodiments, such as Figure 3 As shown, the main positive connector 91 and the first circuit board 31 are spaced apart along the circumferential direction Z of the battery cell.

[0181] In some embodiments, the battery pack includes a connector 93. The connector 93 passes through the second end cap 73, is exposed outside the second end cap 73, and is electrically connected to the second circuit board 8. The connector 93 is configured to connect to an electrical device.

[0182] Based on the above detailed description of several exemplary embodiments of the battery module provided in this application, an exemplary embodiment of the manufacturing method of the battery module provided in this application will be described below.

[0183] In some embodiments, such as Figure 12 As shown, the battery pack manufacturing method proposed in this application includes the following steps:

[0184] A bracket (5) and a cell assembly (1) are provided, wherein the bracket (5) has a first opening (51a); S1: The cell assembly 1 is placed inside the bracket 5;

[0185] A data acquisition component (3) is provided, which includes a first circuit board (31) and a temperature sensing element (32).

[0186] S2: Assemble the first circuit board (31) onto the side of the bracket (5) away from the cell assembly (1), and thermally connect the temperature sensor (32) through the first opening (51a) to at least one cell (10).

[0187] In some embodiments, prior to step S2, the following further includes:

[0188] Thermally conductive adhesive 4 is provided, and the thermally conductive adhesive (4) is applied to at least one battery cell (10);

[0189] 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.

[0190] 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.

[0191] In some embodiments, the electrical equipment may include an electric-assisted bicycle.

[0192] 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 bracket has a first opening; A battery cell assembly is disposed within the bracket, and the battery cell assembly includes multiple battery cells; A data acquisition component is connected to the battery cell assembly. The data acquisition component includes a first circuit board and a temperature detection element. The first circuit board is disposed on the side of the bracket away from the battery cell assembly. The temperature detection element is fixed to the side of the first circuit board close to the battery cell assembly. The temperature detection element passes through the first opening and is thermally connected to at least one of the battery cells.

2. The battery pack according to claim 1, characterized in that, The plurality of battery cells are arranged along a first direction, the battery cells including cylindrical battery cells, the first direction being the axial direction of the cylindrical battery cells; The battery cell includes a battery cell housing, the battery cell housing includes a bottom wall and a top wall disposed opposite to each other, and a peripheral side wall connecting the bottom wall and the top wall; The temperature sensing element passes through the first opening and is thermally connected to at least one of the peripheral sidewalls.

3. The battery pack according to claim 2, characterized in that, The battery pack includes thermally conductive adhesive, wherein the thermal conductivity of the thermally conductive adhesive is 0.

5. (W / m· K) ~2.5 (W / m· K) ； The temperature sensing element is bonded to at least one of the peripheral sidewalls via the thermally conductive adhesive.

4. The battery pack according to claim 3, characterized in that, The battery cell includes a recess; the recess is located on the peripheral sidewall; The thermally conductive adhesive is located in the recess, and at least a portion of the temperature sensing element is disposed opposite to the recess.

5. The battery pack according to any one of claims 2-4, characterized in that, The battery pack includes multiple current-combining components; each current-combining component includes a first current-combining element and a second current-combining element, and along the first direction, the first current-combining element and the second current-combining element are respectively connected to both sides of the same battery cell; The acquisition component includes multiple conductive sheets; the multiple conductive sheets are disposed on the side of the first circuit board away from the battery cell, and are spaced apart along the first direction; The support includes multiple second openings; The first circuit board has multiple third openings, and a first busbar and an adjacent second busbar pass through the same second opening and the same third opening to be connected to the same conductive sheet.

6. The battery pack according to claim 5, characterized in that, The battery cell includes a battery cell housing, electrode terminals, and electrode assemblies; the electrode assemblies are disposed within the battery cell housing. The electrode assembly includes a positive electrode and a negative electrode, one of which is electrically connected to the electrode terminal and the other is electrically connected to the battery cell housing. The electrode terminals and the cell housing of the same battery cell are respectively connected to a first busbar and a second busbar.

7. The battery pack according to any one of claims 1-6, characterized in that, The bracket includes a receiving groove; the first circuit board is located in the receiving groove, and the first opening communicates with the receiving groove.

8. The battery pack according to claim 7, characterized in that, The support includes a first support and a second support; the first support and the second support are connected to form a receiving space, and the battery cell assembly is located within the receiving space; The first bracket includes a main body and a first protrusion and a second protrusion connected to the main body, wherein a portion of the main body, the first protrusion, and the second protrusion form the receiving groove.

9. The battery pack according to any one of claims 1-8, characterized in that, The temperature sensing element includes a first flat surface and a second flat surface that are disposed opposite to each other. The first flat surface is soldered to the first circuit board, and the second flat surface is thermally connected to at least one of the battery cells.

10. The battery pack according to any one of claims 1-9, characterized in that, The plurality of battery cells are arranged along a first direction; The battery pack includes a second circuit board; along the first direction, the second circuit board is disposed at one end of the cell assembly, and the second circuit board is electrically connected to the positive terminal of the cell assembly, the negative terminal of the cell assembly, and the first circuit board.

11. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-10.

12. A method for manufacturing a battery pack as described in any one of claims 1-10, characterized in that, Includes the following steps: A bracket and a battery cell assembly are provided, the bracket having a first opening; S1: Place the battery cell assembly inside the bracket; A data acquisition component is provided, the data acquisition component including a first circuit board and a temperature detection element; S2: Assemble the first circuit board onto the side of the bracket away from the battery cell assembly, and thermally connect the temperature sensing element to at least one of the battery cells after passing through the first opening.

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