Battery pack

Abstract

The application relates to the battery technical field, aims to solve the problem of how to improve the safety performance of a battery pack, and provides the battery pack. The battery pack comprises a battery cell module, a battery cell support and a plurality of connecting pieces. The battery cell module comprises a plurality of battery cells, and the plurality of battery cells are arranged along the length direction of the battery cell module; wherein the length direction intersects the axial direction of the battery cells. The battery cell support is connected with the battery cell module. The creepage distance between two adjacent connecting pieces is greater than or equal to 4 mm. Each connecting piece has a connecting piece main body connected with the battery cells at least in part and a removal feature located at the end of the connecting piece main body, and the removal feature is located at the minimum spacing between two adjacent connecting pieces. The application has the beneficial effect of improving the safety performance of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to battery packs. Background Technology

[0002] A battery pack is provided in the related art, which includes multiple battery cells and multiple connecting pieces connecting the multiple battery cells in series or parallel. However, the distance between the connecting pieces in the related art is small, resulting in lower safety. Utility Model Content

[0003] This application provides a battery pack to address the issue of how to improve the safety performance of a battery pack.

[0004] Embodiments of this application provide a battery pack, including a cell module, a cell support, and multiple connecting tabs. The cell module includes multiple cells arranged along its length; wherein the length direction intersects the axial direction of the cells. The cell support is connected to the cell module. The multiple connecting tabs have a creepage distance greater than or equal to 4 mm between adjacent connecting tabs. Each connecting tab has a connecting tab body at least partially connected to a cell and a removal feature located at the end of the connecting tab body, the removal feature being located at the minimum spacing between two adjacent connecting tabs.

[0005] The aforementioned battery pack, by incorporating a removal feature at the minimum distance between two adjacent connecting pieces, effectively increases the minimum distance between them, thereby increasing the creepage distance and improving the battery pack's safety performance. Since the creepage distance between two adjacent connecting pieces is greater than or equal to 4 mm, the battery pack exhibits high safety performance and reduces the risk of spontaneous combustion.

[0006] In one embodiment, the connecting piece body of each connecting piece is staggered from the connecting piece bodies of adjacent connecting pieces along the height direction of the cell module. The height direction and length direction intersect the axial direction of the cell in pairs.

[0007] In one embodiment, at least two connecting pieces are intermediate connecting pieces and are arranged adjacent to each other along the length direction, and the connecting piece bodies of the intermediate connecting pieces are respectively connected to at least two battery cells adjacent to each other along the length direction.

[0008] In one embodiment, the intermediate connecting piece further includes an extension, one end of which is connected to the upper side of the connecting piece body of the intermediate connecting piece, and the other end of which extends along the axial direction of the battery cell. Along the length direction, the connecting piece body of at least one intermediate connecting piece is disposed opposite to the extension of an adjacent intermediate connecting piece.

[0009] In one embodiment, the two connecting pieces are a positive connecting piece and a negative connecting piece, respectively. The connecting piece bodies of the positive and negative connecting pieces are each connected to a battery cell, and the connecting piece bodies of the positive and negative connecting pieces are located at both ends of the battery cell module along its length.

[0010] In one embodiment, a portion of the battery cell is exposed on the side where the removed feature is located near the adjacent connecting piece.

[0011] In one embodiment, the connecting piece body includes a first body portion and a second body portion. The first body portion covers a portion of the surface of the battery cell and is connected to the battery cell, and the first body portion has a removal feature. The second body portion is connected to the first body portion and is located on the side of the battery cell support away from the battery cell along the axial direction of the battery cell.

[0012] In one embodiment, the outer edge of the first main body includes a curved segment and a straight segment. The straight segment is located at one end of the connecting piece body along the length direction and extends along the height direction of the battery cell module. The two ends of the curved segment are respectively connected to the two ends of the straight segment. The curved segment extends circumferentially along the battery cell. The height direction and the length direction intersect the axial direction of the battery cell in pairs. The second main body is wrapped around the curved segment, and the straight segment constitutes a removal feature.

[0013] In one embodiment, the connecting piece further includes a guide groove penetrating the first main body. The guide groove has a straight guide groove extending along its length and an arc-shaped guide groove connected to one side of the straight guide groove. The arc-shaped guide groove is located on the side of the straight guide groove away from the removal feature. Multiple cell solder joints are distributed on both sides of the guide groove.

[0014] In one embodiment, the cell support has a recess for accommodating at least a portion of the connecting piece, the recess being formed by the cell support recessing into the cell module. The recess has an opening through which at least a portion of the connecting piece passes and connects to the cell. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a perspective view of a battery pack according to one embodiment of this application.

[0017] Figure 2 for Figure 1 Exploded view of the battery pack in the illustrated embodiment.

[0018] Figure 3 for Figure 1 A partial three-dimensional view of the battery pack in the illustrated embodiment.

[0019] Figure 4 for Figure 1 A partial structural side view of the battery pack in the illustrated embodiment.

[0020] Figure 5 for Figure 1 A perspective view of the multiple connecting pieces in the illustrated embodiment.

[0021] Figure 6 for Figure 1 A schematic diagram of the assembly state of the cell support and cell module in the illustrated embodiment.

[0022] Figure 7 for Figure 6 A magnified view of a portion at point A in the illustrated embodiment.

[0023] Figure 8 for Figure 1 The diagram shows the assembly state of the battery cell support and multiple connecting pieces in the embodiment shown.

[0024] Figure 9 for Figure 1 A perspective view of the battery cell support in the illustrated embodiment.

[0025] Figure 10 for Figure 9 A magnified view of a section at point B in the middle.

[0026] Figure 11 for Figure 1 A top view of a portion of the battery pack structure in the illustrated embodiment.

[0027] Figure 12 for Figure 1 A top view of the circuit board in the illustrated embodiment.

[0028] Explanation of key component symbols:

[0029] Battery pack 100

[0030] Casing 10

[0031] Upper shell 11

[0032] Lower housing 12

[0033] Battery cell module 20

[0034] Cell 21

[0035] 30 cell support

[0036] Recess 301

[0037] Opening 302

[0038] Wall 31

[0039] First Enclosure 311

[0040] Second Enclosure 312

[0041] Connection structure 313

[0042] Incline 3135

[0043] Bending wall 3137

[0044] Protrusion 3139

[0045] First Guiding Section 31391

[0046] Second guidance section 31392

[0047] Third Guidance Department 31393

[0048] Hollow out space 3133

[0049] Opening 3134

[0050] Reception cavity 32

[0051] Connecting piece 40

[0052] First row connecting piece 40a

[0053] Second row connecting piece 40b

[0054] Intermediate connecting piece 401

[0055] First connecting piece 4011

[0056] Second connecting piece 4012

[0057] Total positive connector 402

[0058] Total negative connector 403

[0059] Connecting piece body 41

[0060] First Main Body Section 411

[0061] Superior arc segment 4111

[0062] Straight section 4112

[0063] Second main body section 412

[0064] Extension 42

[0065] First extension 421

[0066] Second extension 422

[0067] Remove feature 43

[0068] Guide channel 44

[0069] Straight-line guide channel 441

[0070] Arc-shaped guide channel 442

[0071] Peripheral 45

[0072] First piece 451

[0073] Second piece 452

[0074] Third piece 453

[0075] Circuit board connection part 46

[0076] Cell solder joint 47

[0077] Circuit board 50

[0078] Part 1, 51

[0079] 511 clearance space

[0080] First extension section 512

[0081] Second extension 513

[0082] Part 2, page 52

[0083] Slot 53

[0084] Pad 54

[0085] First pad 54a

[0086] Second pad 54b

[0087] Output terminal 60

[0088] Spring support frame 70

[0089] 80 connecting wire harness

[0090] Terminal bracket 90

[0091] Operating component 110

[0092] Spring 120

[0093] Light panel 130

[0094] Waterproof and dustproof paper 140

[0095] Length direction X

[0096] Z-axis height

[0097] Axial Y-axis of the battery cell

[0098] Actual spacing d0

[0099] First distance d1

[0100] Second distance d2

[0101] Third distance d3

[0102] First width W1

[0103] Second width W2

[0104] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0105] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0106] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0107] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0108] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0109] Figure 1 This is a perspective view of a battery pack 100 in one embodiment of this application; Figure 2 for Figure 1 Exploded view of the battery pack 100 in the illustrated embodiment; Figure 3 for Figure 1 A partial three-dimensional view of the battery pack 100 in the illustrated embodiment.

[0110] See Figure 1 and Figure 2 This embodiment provides a battery pack 100 for providing power to external devices or storing power. The battery pack 100 includes a housing 10 and a cell module 20, a cell support 30, a plurality of connecting pieces 40, a circuit board 50, and an output terminal 60 housed within the housing 10.

[0111] The housing 10 includes an upper housing 11 and a lower housing 12 that covers the upper housing 11, providing physical protection and isolating the external environment (such as dustproof, waterproof, and impact-resistant). The cell module 20 is the core carrier for storing electrical energy in the battery pack 100, and includes multiple cells 21. The cell support 30 is connected to the cell module 20 to arrange and position the multiple cells 21 in an orderly manner, preventing the cells 21 from shaking or colliding. The connecting piece 40 is used to connect the individual cells 21 within the cell module 20 in series and / or parallel to integrate and form the voltage and current output capabilities required by external devices. Connecting cells 21 in series increases the total voltage, while connecting cells 21 in parallel increases the total capacity.

[0112] Please refer to the following: Figure 3 The circuit board 50 is equipped with output terminals 60. At least one end of some of the output terminals 60 is connected to the internal circuitry of the circuit board 50, and the other end of the output terminals 60 can be connected to the power supply interface of an external device. Simultaneously, the circuit board 50 establishes an electrical connection with the cell module 20 and the connecting piece 40. The circuit board 50 typically integrates a battery management system (BMS), which monitors the voltage, temperature, and charge status of the cell 21 in real time, and triggers a protection mechanism when the cell 21 experiences abnormalities such as overcharging, over-discharging, or overheating. When the battery is in normal condition, the electrical energy stored in the cell module 20 is stably transmitted to the external device through the output terminals 60, ultimately ensuring that the battery pack 100 safely and stably completes energy storage and power supply. Optionally, such as... Figure 2 As shown, there are multiple output terminals 60, and the battery pack 100 also includes a terminal bracket 90. The terminal bracket 90 is used to mount the multiple output terminals 60 and passes through the multiple output terminals 60 so that the multiple output terminals 60 are insulated from each other.

[0113] In some embodiments, the battery pack 100 further includes an operating element 110, a spring 120, a spring support frame 70, a connecting harness 80, and a light panel 130. The operating element 110 is movably mounted on the housing 10 and protrudes from the outside of the housing 10 to facilitate unlocking by an operator. The spring support frame 70 is connected to the cell support 30, and the spring 120 elastically abuts against the operating element 110 and the spring support frame 70. Optionally, the spring support frame 70 and the cell support 30 are integrally formed. The light panel 130 is connected to the circuit board 50 via the connecting harness 80, and the light panel 130 can be used, for example, to display the remaining power of the battery pack 100.

[0114] For ease of understanding, this application describes the battery cell module 20 along its length direction X, height direction Z, and axis Y. Multiple battery cells 21 are arranged along the length direction X and height direction Z of the battery cell module 20. In this embodiment, the multiple battery cells 21 are arranged in 5 columns along the length direction X and 2 rows along the height direction Z. In other embodiments, the number and arrangement of battery cells 21 can be different and are not limited here. The length direction X, height direction Z, and axis Y of the battery cell module 20 are three non-parallel directions in a spatial coordinate system. In subsequent embodiments, the length direction X, height direction Z, and axis Y of the battery cell module 20 are described as three mutually perpendicular reference directions in a three-dimensional Cartesian coordinate system. The directions shown in this application are used to help understand the relative positions of the components, but their specific directions are not limited.

[0115] Figure 4 for Figure 1 A partial structural side view of the battery pack 100 in the illustrated embodiment.

[0116] In some embodiments, such as Figure 4 As shown, the creepage distance between two adjacent connecting pieces 40 is greater than or equal to 4 mm. Each connecting piece 40 has a connecting piece body 41 that is at least partially connected to the battery cell 21 and a removal feature 43 located at the end of the connecting piece body 41. The removal feature 43 is located at the minimum distance between two adjacent connecting pieces 40.

[0117] The aforementioned battery pack 100, by providing a removal feature 43 at the minimum distance between two adjacent connecting pieces 40, facilitates an increase in the minimum distance between the two adjacent connecting pieces 40, thereby increasing the creepage distance between them and improving the safety performance of the battery pack 100. Since the creepage distance between two adjacent connecting pieces 40 is greater than or equal to 4 mm, the battery pack 100 exhibits high safety performance and reduces the risk of spontaneous combustion.

[0118] It should be noted that creepage distance refers to the shortest distance between two conductive parts along the surface of a solid insulating material. The minimum spacing between two adjacent connecting pieces 40 is the smallest spacing value among the set of spacings of all adjacent connecting pieces 40. Feature 43 is obtained by removing a portion from the connecting piece body 41. Figure 4 The diagram shows the connecting piece body 41 with this portion removed. The minimum spacing refers to the spacing between the two connecting pieces 40 before this portion was removed. Optionally, where the minimum spacing is the spacing between two adjacent connecting pieces 40 along the length direction X, and the removal feature 43 is located at one end of the connecting piece 40 along the length direction X, then the actual spacing d0 between the two connecting pieces 40 at the minimum spacing is the minimum spacing plus the dimension along the length direction X of the portion of the connecting piece body 41 that has been removed.

[0119] In some embodiments, such as Figure 3 As shown, the connecting piece body 41 of each connecting piece 40 is staggered from the connecting piece body 41 of adjacent connecting pieces 40 along the height direction Z of the cell module 20 to avoid the connecting piece bodies 41 of two adjacent connecting pieces 40 being opposite each other along the length direction X, which would result in an overly compact distribution of the connecting piece bodies 41. This further facilitates increasing the spacing between adjacent connecting pieces 40 along the length direction X and allows for a larger size of the connecting piece body 41 along the length direction X, making it easier for the connecting piece body 41 to connect to the cell 21.

[0120] In some embodiments, such as Figure 3 As shown, at least two connecting pieces 40 are intermediate connecting pieces 401 and are arranged adjacently along the length direction X. The connecting piece body 41 of the intermediate connecting piece 401 is connected to at least two adjacent battery cells 21 along the length direction X to facilitate series or parallel connection. The extension directions of the at least two intermediate connecting pieces 401 are parallel to each other, that is, they both extend along the length direction X to facilitate the arrangement of the intermediate connecting pieces 401. Optionally, there are multiple intermediate connecting pieces 401, and each intermediate connecting piece 401 is connected to two adjacent battery cells 21 along the length to connect multiple battery cells 21 in series. In this embodiment, there are 4 intermediate connecting pieces 401, and the 10 battery cells 21 of the battery cell module 20 are connected in series.

[0121] In some embodiments, such as Figure 3As shown, the intermediate connecting piece 401 also includes an extension 42. One end of the extension 42 is connected to the upper side of the connecting piece body 41 of the intermediate connecting piece 401, and the other end of the extension 42 extends along the axial direction Y of the battery cell. Along the length direction X, at least one connecting piece body 41 of the intermediate connecting piece 401 is disposed opposite to the extension 42 of the adjacent intermediate connecting piece 401. Thus, by providing the extension 42, the intermediate connecting pieces 401 can all extend to the upper side of the battery cell module 20, thereby facilitating connection with the circuit board 50 located in the battery cell module 20 through the extension 42, so as to detect voltage through the extension 42. It should be noted that, for ease of explanation, in this embodiment, the upper side refers to the side closer to the upper housing 11 along the height direction Z (see Figure 2 On one side of the extension. Optionally, the extension 42 is configured as a strip.

[0122] Figure 5 for Figure 1 A perspective view of the plurality of connecting pieces 40 in the illustrated embodiment.

[0123] In some embodiments, such as Figure 3 As shown, at least one intermediate connecting piece 401 is a first connecting piece 4011, and at least another intermediate connecting piece 401 is a second connecting piece 4012. The first connecting piece 4011 and the second connecting piece 4012 are arranged adjacent to each other along the length direction X. The connecting piece body 41 of the first connecting piece 4011 is close to the cell module 20 (see...). Figure 2 The upper edge of the first connecting piece 4011 is provided, with one end of the extension 42 of the first connecting piece 4011 bent and connected to the connecting piece body 41, and the other end extending along the axial direction Y of the cell. The connecting piece body 41 of the second connecting piece 4012 is provided near the lower edge of the cell module 20, and is combined with... Figure 5 As shown, the extension 42 of the second connecting piece 4012 includes a first extension 421 and a second extension 422. One end of the first extension 421 is connected to the upper side of the connecting piece body 41, and the first extension 421 and the connecting piece body 41 are located on the same side of the cell module 20. The second extension 422 is located on the upper side of the cell module 20. One end of the second extension 422 is bent and connected to the end of the first extension 421 away from the connecting piece body 41. The other end of the second extension 422 extends along the axial direction Y of the cell.

[0124] It should be noted that the current-carrying capacity of the connecting piece 40 is positively correlated with the effective cross-sectional area of ​​the current flow path. Let the dimension of the connecting piece body 41 along the height direction Z be the first width W1; increasing the first width W1 increases the current-carrying area of ​​the connecting piece body 41. Let the dimension of the extension 42 along the length direction X be the second width W2. Since the extension 42 can be used to collect the voltage signal of the battery cell 21, and the voltage detection circuit only needs to carry a very small current, the extension 42 is allowed to have a narrower second width W2. This allows for flexible arrangement among the densely packed battery cells 21 and connecting pieces 40, avoiding excessive space occupation.

[0125] In this embodiment, the minimum spacing is the spacing between the connecting piece body 41 of the first connecting piece 4011 and the first extension 421 of the adjacent second connecting piece 4012 along the length direction X. Since the end of the connecting piece body 41 near the adjacent first extension 421 has a removal feature 43, and the extension 42 is allowed to have a narrower second width W2, it is ensured that the actual spacing d0 is greater than the safety spacing.

[0126] In some embodiments, such as Figure 3 As shown, the two connecting pieces 40 are the main positive connecting piece 402 and the main negative connecting piece 403. The connecting piece bodies 41 of the main positive connecting piece 402 and the main negative connecting piece 403 are each connected to a battery cell 21. The connecting piece bodies 41 of the main positive connecting piece 402 and the main negative connecting piece 403 are located at both ends of the battery cell module 20 along the length direction X. It should be noted that the main positive connecting piece 402 is used to carry the total positive current, and the main negative connecting piece 403 is used to carry the total negative current. Since their core function is to transmit power current to external loads (such as power tools), both need to have a large current-carrying capacity. Furthermore, due to the requirement for a larger heat dissipation area for high current, by setting the main positive connecting piece 402 and the main negative connecting piece 403 at both ends of the battery cell module 20, the main positive connecting piece 402 and the main negative connecting piece 403 have a larger layout space, allowing them to extend to both end faces of the battery cell module 20 along the length direction X, thereby improving current carrying and heat dissipation capabilities and facilitating the design of the current path.

[0127] In some embodiments, such as Figure 4 As shown, a portion of the battery cell 21 is exposed on the side of the removal feature 43 along the length direction X close to the adjacent connecting piece 40, so that the end of the connecting piece body 41 with the removal feature 43 is located within the range of the battery cell 21, which further helps to increase the minimum spacing between two adjacent connecting pieces 40.

[0128] In some embodiments, such as Figure 4As shown, the connecting piece body 41 includes a first body portion 411 and a second body portion 412. The first body portion 411 covers a portion of the surface of the battery cell 21 and is connected to the battery cell 21. The first body portion 411 is provided with a removal feature 43. The second body portion 412 is connected to the first body portion 411 and is located on the side of the battery cell support 30 away from the battery cell 21 along the axial direction Y of the battery cell. Thus, by providing the first body portion 411 closer to the battery cell 21, the welding of the connecting piece body 41 to the battery cell 21 is more convenient. Optionally, the intermediate connecting piece 401 has two first body portions 411 spaced apart along the length direction X, and the second body portion 412 of the intermediate connecting piece 401 is connected between the two first body portions 411 to conduct electricity between two adjacent battery cells 21 along the length direction X.

[0129] In some embodiments, such as Figure 4 As shown, the outer edge of the first main body 411 includes a curved segment 4111 and a straight segment 4112. The straight segment 4112 is located at one end of the connecting piece body 41 along the length direction X and extends along the height direction Z. The two ends of the curved segment 4111 are respectively connected to the two ends of the straight segment 4112. The curved segment 4111 extends circumferentially along the cell 21. The second main body 412 is wrapped around the curved segment 4111, and the straight segment 4112 constitutes the removal feature 43. Thus, by providing the straight segment 4112, the size of the connecting piece body 41 along the length direction X is reduced, thereby increasing the spacing between adjacent connecting pieces 40. By providing the curved segment 4111 to extend circumferentially along the cell 21, and by providing the second main body 412 to wrap around the curved segment 4111, the first width W1 of the connecting piece body 41 is increased, thereby improving the current carrying capacity.

[0130] For example, in one embodiment, while ensuring the creepage distance, the first width W1 can be greater than or equal to 11 mm (which can be appropriately increased according to actual needs), and copper-plated tin material is used. The current carrying capacity of copper-plated tin material is 15 amps per square millimeter. The thickness of the connecting piece 40 is 0.25 mm. The theoretical current carrying capacity of the connecting piece 40 can be calculated to be greater than or equal to 41.25 amps, while the current carrying capacity of the battery cell 21 is 30 amps. Therefore, the discharge performance of the battery cell 21 can be fully utilized.

[0131] In some embodiments, such as Figure 4As shown, the connecting piece 40 also includes a flow guide groove 44 penetrating the first main body 411. The flow guide groove 44 has a straight flow guide groove 441 extending along the length direction X and an arc-shaped flow guide groove 442 connected to one side of the straight flow guide groove 441. The arc-shaped flow guide groove 442 is located on the side of the straight flow guide groove 441 away from the removal feature 43. Multiple cell solder joints 47 are distributed on both sides of the flow guide groove 44. Thus, by setting the flow guide groove 44, the current conduction path is optimized, and the connection safety and reliability are improved. By setting the arc-shaped flow guide groove 442, the length of the flow guide groove 44 becomes insufficient after removing one end of the connecting piece 40, so an additional arc-shaped flow guide groove 442 is needed to compensate for the length deficiency.

[0132] Figure 6 for Figure 1 A schematic diagram of the assembly state of the cell support 30 and the cell module 20 in the embodiment shown.

[0133] In some embodiments, such as Figure 5 As shown, the cell support 30 is provided with a means to accommodate at least a portion of the connecting piece 40 (see...). Figure 4 The recessed portion 301 is formed by the cell support 30 recessing into the cell module 20. An opening 302 is provided on the recessed portion 301, through which at least a portion of the connecting piece 40 passes and connects to the cell 21. Thus, by providing the recessed portion 301, the outer surface of the connecting piece 40 is flush with the outer surface of the cell support 30, which helps improve waterproof and dustproof performance. For example, the battery pack 100 also includes a waterproof and dustproof paper 140 (see...). Figure 2 The waterproof and dustproof paper 140 is attached to the outside of the connecting piece 40 and the cell bracket 30. Since the connecting piece 40 does not protrude from the cell bracket 30, the waterproof and dustproof paper 140 has a better effect.

[0134] Therefore, in this embodiment, by setting the connecting piece bodies 41 of adjacent connecting pieces 40 to be staggered along the height direction Z, and the connecting pieces 40 extending along the length direction X with a removal feature 43 at one end along the length direction X, the creepage distance between two adjacent connecting pieces 40 is ensured to be greater than the safe distance, which is applicable to battery cells 21 with smaller diameters. By setting the outer edge of the first main body portion 411 of the connecting piece body 41 to have a superior arc segment 4111, and the second main body portion 412 wrapped around the superior arc segment 4111, it is beneficial to increase the first width W1 of the connecting piece body 41, so that the battery cell 21 can exert its full performance.

[0135] Figure 7 for Figure 6 A magnified view of a portion at point A in the illustrated embodiment; Figure 8 for Figure 1 A schematic diagram of the assembly state of the cell support 30 and multiple connecting pieces 40 in the embodiment shown. Figure 9 for Figure 1A perspective view of the cell support 30 in the illustrated embodiment.

[0136] In some embodiments, such as Figure 6 As shown, the battery cell support 30 includes a enclosure 31, within which the battery cell 21 is installed. The enclosure 31 includes a first enclosure 311, a second enclosure 312, and a connecting structure 313, which connects the first enclosure 311 and the second enclosure 312. Figure 7 As shown, the outer side of the connecting structure 313 has an inclined surface 3135, and the plane containing the inclined surface 3135 intersects the planes containing the outer surfaces of the first enclosure wall 311 and the second enclosure wall 312, respectively. Figure 8 As shown, at least one connecting piece 40 includes a peripheral portion 45 located outside the enclosure 31. The peripheral portion 45 has a mating surface (not shown) on the side near the enclosure 31, which mats with the inclined surface 3135. Thus, by providing the peripheral portion 45, the connecting piece 40 can extend along the outside of the enclosure 31 to the desired location, such as extending to the circuit board 50 for connection. When the battery cell 21 is a cylindrical cell, since the cell support 30 has a connecting structure 313 with an inclined surface 3135 for mating the connecting piece 40, the mating surface of the connecting piece 40 does not need to be curved. This reduces manufacturing difficulty and cost, and also reduces the difficulty of fitting the mating surface and the inclined surface 3135, thus improving fitting accuracy and making stress distribution more uniform. This improves the structural stability and reliability of the battery pack 100, making the battery pack 100 suitable for tools subject to significant vibration.

[0137] It should be noted that the outer side of the enclosure 31 refers to the outer perimeter of the enclosure 31 surrounding the cell support 30. Optionally, the connecting piece 40 is formed by stamping. During assembly, the cell 21 can be first installed on the cell support 30 and fixed with screws or other fasteners. Then, the connecting piece 40 is roughly positioned to the cell support 30, the connecting piece 40 is welded to the cell 21, and then the connecting piece 40 is welded to the circuit board 50.

[0138] A related technology provides a battery pack in which the cell support and connecting piece are bonded together by curved surfaces. Because the two curved surfaces are prone to diameter deviations, fitting is difficult. Under high vibration conditions, the fitting defects between the two curved surfaces will exacerbate the relative displacement between them, leading to fatigue damage at the solder joints (e.g., the solder joint between the connecting piece and the circuit board). In contrast, the battery pack 100, by bonding the bonding surface with the inclined surface 3135, allows the connecting piece 40 to be stably fixed relative to the cell support 30, avoiding the risk of tearing or pulling between the connecting piece 40 and the circuit board 50 due to deformation caused by vibration or compression, thus preventing a circuit break.

[0139] In some embodiments, such as Figure 9As shown, the enclosure 31 has a receiving cavity 32 for installing the battery cell 21 (see Figure 32). Figure 9 The receiving cavity 32 has multiple cavities, each corresponding to a different battery cell 21. The shape and size of the receiving cavity 32 are adapted to the corresponding battery cell 21 to position the battery cell 21.

[0140] In some embodiments, such as Figure 7 As shown, the connecting structure 313 includes a curved wall 3137 and a protrusion 3139 extending outward from the curved wall 3137. The curved wall 3137 connects between the first enclosure wall 311 and the second enclosure wall 312, and the outer side of the protrusion 3139 is provided with a slope 3135. Thus, by providing the curved wall 3137, it is easy to adapt to the shape of the cylindrical battery cell 21, and by providing the protrusion 3139, it is beneficial to increase the heat dissipation area of ​​the connecting structure 313.

[0141] In some embodiments, there are multiple protrusions 3139, which are spaced apart along the axial direction Y of the battery cell to further increase the heat dissipation area of ​​the connection structure 313.

[0142] In some embodiments, the protrusion 3139 is a rib extending circumferentially along the curved wall 3137, which simplifies the structure of the protrusion 3139 and makes it easy to process.

[0143] Figure 10 for Figure 9 A magnified view of a section at point B in the middle.

[0144] In some embodiments, such as Figure 10 As shown, the protrusion 3139 is a hollow structure extending circumferentially along the curved wall 3137. The hollow structure has at least one hollowed-out space 3133. On the side of the protrusion 3139 away from the receiving cavity 32, there is an opening 3134 communicating with the hollowed-out space 3133, thereby increasing the heat dissipation area of ​​the protrusion 3139. Optionally, there are multiple hollowed-out spaces 3133, which are spaced apart circumferentially along the curved wall 3137.

[0145] It should be noted that there can be multiple protrusions 3139, and each protrusion 3139 can be either a rib or a hollow structure.

[0146] In some embodiments, such as Figure 7As shown, the protrusion 3139 includes a first guide portion 31391, a second guide portion 31392, and a third guide portion 31393. The second guide portion 31392 has an inclined surface 3135 on its outer side. The first guide portion 31391 connects between the first enclosure wall 311 and the second guide portion 31392, and the outer surface of the first guide portion 31391 is coplanar with the outer surface of the first enclosure wall 311. The third guide portion 31393 connects between the second guide portion 31392 and the second enclosure wall 312, and the outer surface of the third guide portion 31393 is coplanar with the outer surface of the second enclosure wall 312. This facilitates the connection of the connecting piece 40 to the first guide portion 31391 and the third guide portion 31393 on both sides of the contact surface, thereby increasing the contact area between the connecting piece 40 and the cell support 30 and making stress distribution more uniform.

[0147] Figure 11 for Figure 1 A partial top view of the battery pack 100 in the illustrated embodiment.

[0148] In some embodiments, such as Figure 11 As shown, the circuit board 50 is located on the side of the first enclosure 311 away from the battery cell 21. The connecting piece 40 also includes a circuit board connecting portion 46 for connecting with the circuit board 50. At least one peripheral portion 45 includes a first piece 451, a second piece 452, and a third piece 453. The first piece 451 is attached to the first enclosure 311 and has the circuit board connecting portion 46. The third piece 453 is attached to the second enclosure 312. The second piece 452 is connected between the first piece 451 and the third piece 453 and has a mating surface. In this way, the peripheral portion 45 includes three sheet-like structures, which facilitates the processing of the connecting piece 40 and increases the contact area between the connecting piece 40 and the battery cell support 30.

[0149] In some embodiments, such as Figure 6 As shown, there are two second enclosure walls 312, located on opposite sides of the first enclosure wall 311. There are also two connecting structures 313, each corresponding to one of the two second enclosure walls 312 and connected between the first enclosure wall 311 and the corresponding second enclosure wall 312, thus allowing them to fit against the outer periphery 45 of the two connecting pieces 40. Optionally, the second enclosure walls 312 are located on opposite sides of the first enclosure wall 311 along its length direction X.

[0150] In some embodiments, such as Figure 7As shown, the main positive connecting piece 402 is located on the outside of one of the second enclosure walls 312, and the main negative connecting piece 403 is located on the outside of the other second enclosure wall 312. Both the main positive connecting piece 402 and the main negative connecting piece 403 include a peripheral portion 45. This allows the peripheral portions 45 of the main positive connecting piece 402 and the main negative connecting piece 403 to extend from the outside of the second enclosure wall 312 to the outside of the first enclosure wall 311 via the connecting structure 313. Since the outside of the second enclosure wall 312 has a larger installation space, the width of the peripheral portion 45 can be increased, thereby facilitating an increase in the current-carrying area of ​​the main positive connecting piece 402 and the main negative connecting piece 403, respectively.

[0151] Figure 12 for Figure 1 A top view of the circuit board 50 in the illustrated embodiment.

[0152] In some embodiments, such as Figure 12 As shown, the circuit board 50 has multiple solder pads 54, which are spaced apart along a first direction. The solder pads 54 are spaced apart by a first distance d1, a second distance d2, and a third distance d3 along the first direction. The first distance d1 is less than the third distance d3, and the first distance d1 is equal to the second distance d2. This arrangement provides two independent minimum distances (i.e., the first distance d1 and the second distance d2) between the solder pads 54, rather than a single minimum distance, preventing a single minimum distance from becoming a weak point in safety performance. This averages out the probability of creepage, short circuits, and other risks, thereby improving safety performance. Optionally, the first direction is the length direction X of the battery module 20. The solder pads 54 are soldered to the connecting pieces 40 in a one-to-one correspondence.

[0153] In some embodiments, such as Figure 11 As shown, the end of the connecting piece 40 away from the battery cell 21 is provided with a circuit board connection part 46, such as... Figure 12 As shown, the circuit board 50 is provided with a slot 53 through which the circuit board connection part 46 passes. The edge of the slot 53 forms a pad 54, and the circuit board connection part 46 is soldered to the pad 54.

[0154] In some embodiments, such as Figure 12 As shown, one pad 54 is separated from the adjacent pads 54 by a first distance d1 and a second distance d2, respectively. This places the shortest distances, d1 and d2, on either side of the same pad 54, facilitating adjustments to the distribution of multiple pads 54 during design. For example, the position of a pad 54 at a single minimum distance in the existing layout can be adjusted so that this pad 54 is equidistant from the adjacent pads 54.

[0155] In some embodiments, such as Figure 12As shown, at least one pad 54 is a first pad 54a, and at least another pad 54 is a second pad 54b. The first pad 54a has a larger dimension along the length direction X than the second pad 54b, so that the first pad 54a and the second pad 54b can be used for different application requirements. For example, the first pad 54a can be used to solder conductive components with higher current carrying capacity requirements (such as the total positive connector 402 or the total negative connector 403), and the second pad 54b can be used to solder conductive components arranged in a compact position (such as the intermediate connector 401).

[0156] In some embodiments, such as Figure 12 As shown, at least one first pad 54a is spaced from an adjacent second pad 54b by a first distance d1 or a second distance d2. Thus, since the first pad 54a has a larger size along the length direction X, by setting the shortest first distance d1 or second distance d2 between the first pad 54a and other pads 54, the layout of the pads 54 around the first pad 54a is avoided from being too compact.

[0157] In some embodiments, the first pad 54a is located at the end of the circuit board 50 along the length direction X to make the current transmission path reasonable.

[0158] In some embodiments, there are two first pads 54a, and the two connecting pieces 40 corresponding to the two first pads 54a are a total positive connecting piece 402 and a total negative connecting piece 403, so that the distribution of the pads 54 matches the distribution of the connecting pieces 40, allowing the total positive connecting piece 402 or the total negative connecting piece 403 to have a larger current-carrying area.

[0159] In some embodiments, such as Figure 8 As shown above, the positive connecting piece 402 and the negative connecting piece 403 also include a peripheral portion 45. One end of the peripheral portion 45 is bent and connected to the connecting piece body 41, and the other end of the peripheral portion 45 is connected to the corresponding first solder pad 54a, so that the connecting piece 40 can be connected to the battery cell 21 and the circuit board 50 respectively.

[0160] In some embodiments, as described above, the intermediate connecting piece 401 further includes an extension 42, one end of which is connected to the connecting piece body 41, and the other end of which is connected to the corresponding second pad 54b, so as to save space occupied by the extension 42.

[0161] In some embodiments, at least two extensions 42 extend along the axial direction Y of the cell at one end connected to the second pad 54b for easy arrangement.

[0162] In some embodiments, multiple extensions 42 are arranged adjacent to each other and uniformly along the length direction X. This makes the pads 54 more evenly distributed, which helps to average the probability of risk occurrence and further improves safety performance.

[0163] In some embodiments, one of the extensions 42 is adjacent to the total positive connector 402 or the total negative connector 403 and extends obliquely toward the side away from the adjacent first pad 54a to increase the spacing between the first pad 54a and the surrounding pads 54.

[0164] Therefore, by making the pads 54 on the circuit board 50 more evenly distributed and improving the consistency of the distance between adjacent pads 54, the battery pack 100 distributes the probability of risk in the risk area of ​​the battery pack 100 more evenly, thereby reducing the risk that the risk area may bring.

[0165] See Figure 10 In some embodiments, as described above, the connecting piece 40 has a circuit board connection portion 46 located away from the battery cell 21. Please refer to [the relevant documentation / reference]. Figure 12 The circuit board 50 includes a first portion 51 and a second portion 52 distributed along the length direction X. The first portion 51 has a clearance space 511, and at least a portion of at least one pad 54 is located in the first portion 51. Thus, by providing the first portion 51, more space is provided for the arrangement of multiple circuit board connections 46 along the length direction X, which facilitates increasing the spacing between adjacent connection pieces 40, improving safety performance, and also facilitates increasing the copper foil circuitry inside the circuit board 50, thereby obtaining a higher overcurrent value. Optionally, as... Figure 10 As shown, the circuit board connection portion 46 of the total negative connection piece 403 (or the total positive connection piece 402) protrudes outward along the height direction Z from the end of the outer portion 45 away from the connection piece body 41, and the circuit board connection portion 46 of the middle connection piece 401 protrudes outward along the height direction Z from the end of the extension portion 42 away from the connection piece body 41.

[0166] In some embodiments, such as Figure 12 As shown above, there are two first pads 54a. The two first pads 54a are located at the ends of the circuit board 50 along the length direction X, and the two first pads 54a are located on the same side of the circuit board 50 along the axial direction Y of the cell, so as to connect the total positive connection piece 402 and the total negative connection piece 403 located on the same side, respectively.

[0167] In some embodiments, such as Figure 11 and Figure 12As shown, the first part 51 includes a first extension 512 and a second extension 513, which are located on opposite sides of the clearance space 511 along the axial direction Y of the battery cell. Multiple connecting tabs 40 are divided into a first row of connecting tabs 40a and a second row of connecting tabs 40b spaced apart along the axial direction Y of the battery cell. Along the axial direction Y of the battery cell, the pads 54 corresponding to the first row of connecting tabs 40a are located within the first extension 512, and the pads 54 corresponding to the first row of connecting tabs 40a include at least one first pad 54a and at least one second pad 54b spaced apart along the length direction X. Along the axial direction Y of the battery cell, the pads 54 corresponding to the second row of connecting tabs 40b are located within the second extension 513, and the pads 54 corresponding to the second row of connecting tabs 40b include multiple second pads 54b spaced apart along the length direction X. Thus, the circuit board 50 has a U-shaped structure to facilitate the installation of the two rows of connecting tabs 40.

[0168] In some embodiments, the plurality of second pads 54b corresponding to the second row of connecting pieces 40b are evenly distributed along the length direction X, so that the spacing of the pads 54 corresponding to the second row of connecting pieces 40b is consistent, which is beneficial to the variety of connecting pieces 40 and reduces development costs.

[0169] In some embodiments, along the axial direction Y of the battery cell, the pads 54 and the clearance space 511 are staggered to make room for the layout of components on the circuit board 50 and increase the scalability of the battery pack 100.

[0170] In some embodiments, the spacing between two adjacent connecting pieces 40 is 3.9 mm to 7.9 mm to reduce the size of the battery pack 100 while maintaining high safety performance.

[0171] In some embodiments, as described above, the battery pack 100 further includes a spring support frame 70, at least a portion of which is located within the clearance space 511, to improve the utilization of the internal space of the battery pack 100.

[0172] In some embodiments, the battery pack 100 further includes a wiring harness 80, at least a portion of which is located within the clearance space 511, to improve the utilization of the internal space of the battery pack 100.

[0173] In some embodiments, such as Figure 11 As shown above, the cell support 30 includes a first enclosure 311, and the circuit board 50 is located on the side of the first enclosure 311 away from the cell module 20 along the height direction Z. Along the length direction X, both ends of the circuit board 50 extend to both ends of the first enclosure 311, which helps to increase the length of the circuit board 50 along the length direction X, increase the spacing of the connecting pieces 40, and improve safety.

[0174] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A battery pack, characterized in that, include: A battery cell module includes multiple battery cells, which are arranged along the length direction of the battery cell module; wherein the length direction intersects the axial direction of the battery cells. The cell support is connected to the cell module; and, Multiple connecting pieces, wherein the creepage distance between two adjacent connecting pieces is greater than or equal to 4 mm; Each of the connecting pieces has a connecting piece body that is at least partially connected to the battery cell and a removal feature located at the end of the connecting piece body, the removal feature being located at the minimum spacing between two adjacent connecting pieces.

2. The battery pack according to claim 1, characterized in that: The connecting piece body of at least one of the connecting pieces is staggered from the connecting piece body of the adjacent connecting piece along the height direction of the cell module; The height direction and the length direction intersect each other with the axial direction of the battery cell.

3. The battery pack according to claim 2, characterized in that: At least two of the connecting pieces are intermediate connecting pieces and are arranged adjacent to each other along the length direction. The connecting piece body of the intermediate connecting piece is connected to at least two of the battery cells that are adjacent to each other along the length direction.

4. The battery pack according to claim 3, characterized in that: The intermediate connecting piece further includes an extension, one end of which is connected to the upper side of the connecting piece body of the intermediate connecting piece, and the other end of which extends along the axial direction of the battery cell. Along the length direction, the connecting piece body of at least one of the intermediate connecting pieces is disposed opposite to the extension of the adjacent intermediate connecting piece.

5. The battery pack according to claim 2, characterized in that: The two connecting pieces are respectively the main positive connecting piece and the main negative connecting piece; The main body of the main positive connecting piece and the main negative connecting piece are each connected to one of the battery cells, and the main bodies of the main positive connecting piece and the main negative connecting piece are respectively located at both ends of the battery cell module along the length direction.

6. The battery pack according to claim 1, characterized in that: A portion of the battery cell is exposed on the side of the removal feature near the adjacent connecting piece.

7. The battery pack according to claim 1, characterized in that: The connecting piece body includes a first main body portion and a second main body portion; The first main body covers a portion of the surface of the battery cell and is connected to the battery cell; the first main body is provided with the removal feature. The second main body is connected to the first main body, and the second main body is located on the side of the cell support away from the cell along the axial direction of the cell.

8. The battery pack according to claim 7, characterized in that: The outer edge of the first main body includes a curved segment and a straight segment. The straight segment is located at one end of the connecting piece body along the length direction and extends along the height direction of the battery cell module. The two ends of the curved segment are respectively connected to the two ends of the straight segment. The curved segment extends along the circumference of the battery cell. The height direction and the length direction intersect the axial direction of the battery cell in pairs. The second main body is wrapped around the superior arc segment, and the straight segment constitutes the removal feature.

9. The battery pack according to claim 7, characterized in that: The connecting piece further includes a guide groove penetrating the first main body. The guide groove has a straight guide groove extending along the length direction and an arc-shaped guide groove connected to one side of the straight guide groove. The arc-shaped guide groove is located on the side of the straight guide groove away from the removal feature. Multiple cell solder joints are distributed on both sides of the flow channel.

10. The battery pack according to claim 1, characterized in that: The cell support is provided with a recess for accommodating at least a portion of the connecting piece, the recess being formed by the cell support recessing into the cell module; The recessed portion has an opening, and at least a portion of the connecting piece passes through the opening and connects to the battery cell.

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