Battery pack structure and battery

Abstract

A battery pack structure, applied to the technical field of batteries, comprising a housing (1), comprising first plates (11) and a second plate (12), the second plate (12) being arranged perpendicular to the first plates (11), and a plurality of guide slots (121) being formed in the second plate (12); a battery cell groups, comprising a plurality of battery cells (2), the battery cell group being arranged in the housing (1), and tabs (22) of the battery cells (2) passing through the guide slots (121) and being exposed on an outer surface of the second plate (12); a BMS plate (3), arranged outside the second plate (12) in parallel and keeping a gap with the second plate (12); and electrical connection pieces (4), arranged between the second plate (12) and the BMS plate (3), the tabs (22) being electrically connected to the BMS plate (3) by means of the electrical connection pieces (4). According to the battery pack structure, the tabs (22) of the battery cells (2) extend out through the guide slots (121) formed in the second plate (12) of the housing (1), and the tabs (22) are electrically connected to the BMS plate (3) above the second plate (12) by means of the electrical connection pieces (4), thereby saving the materials of an adapter plate, a signal connector and part of foam, effectively reducing the material cost, and improving the space utilization rate of a battery pack. A battery, comprising the battery pack structure.

Description

Battery pack structure and battery Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack structure and a battery. Background Art

[0002] At present, the trend of cordless cleaning appliances (vacuum cleaners, steam machines, floor scrubbers, etc.) and power tools is becoming more and more obvious. Cordless technology brings a lot of convenience and enables people to use tools more flexibly in life and work.

[0003] There are two main types of battery cells used in cleaning appliances and power tools: cylindrical cells and pouch cells. Each has its own advantages and disadvantages. Cylindrical cells offer lower costs and higher production volumes, but also offer slightly lower performance. Pouch cells offer better performance but higher costs. Therefore, simplifying the pouch cell structure, improving internal space utilization, and reducing costs are pressing challenges.

[0004] Summary of the Invention

[0005] In view of this, the present application provides a battery pack structure and a battery. By setting an electrical connecting plate between the second plate of the shell and the BMS board (also known as the BMS battery protection board), the electrode ear is extended from the second plate and electrically connected to the BMS board above the second plate, thereby saving the adapter board, signal connector, and some foam materials, which can effectively reduce material costs and improve the space utilization of the battery pack.

[0006] In order to achieve the above objectives, this application provides the following technical solutions.

[0007] A battery pack structure, comprising:

[0008] The housing comprises a first plate and a second plate, wherein the second plate is arranged perpendicular to the first plate and a plurality of guide grooves are formed on the second plate;

[0009] A battery cell group, comprising a plurality of battery cells, wherein the battery cell group is disposed in the housing, and tabs of the battery cells pass through the guide grooves and are exposed on the outer surface of the second plate;

[0010] A BMS board is arranged parallel to the outside of the second board and has a gap with the second board;

[0011] An electrical connection piece is provided between the second board and the BMS board, and the tab is electrically connected to the BMS board via the electrical connection piece.

[0012] Optionally, the electrical connecting piece includes a connecting piece body connected to the tab of the battery cell and a BMS connecting part connected to the BMS board, the connecting piece body is arranged parallel to the upper surface of the second board, the tab of the battery cell is bent and connected to the upper surface or lower surface of the connecting piece body, and there is a gap between the connecting piece body and the second board.

[0013] Optionally, the distance between the connecting piece body and the second plate is H1, and the value of H1 satisfies: 0.3mm≤H1≤4mm.

[0014] Optionally, the electrical connection piece includes a total positive BUS, a total negative BUS and a signal acquisition connection piece;

[0015] The positive electrode tab of a battery cell at one end of the battery cell group is electrically connected to the total positive BUS;

[0016] The positive electrode tab of a battery cell in the middle of the battery cell group is connected to the negative electrode tab of another adjacent battery cell and is electrically connected to one of the signal acquisition connecting pieces;

[0017] The negative electrode tab of a battery cell at the other end of the battery cell group is electrically connected to the total negative BUS.

[0018] Optionally, an insulating barrier is provided between the total positive BUS and / or the total negative BUS and the adjacent signal acquisition connecting piece.

[0019] Optionally, the battery cells of the battery cell group are arranged along a second direction perpendicular to the first direction;

[0020] The signal acquisition connecting piece includes a first signal connecting piece and a second signal connecting piece, and the first signal connecting piece is evenly arranged at one end of the first direction of the second board; the total positive BUS, the second signal connecting piece and the total negative BUS are evenly distributed in sequence at the other end of the first direction of the second board, wherein the first direction of the second board is a direction parallel to the length direction of the battery cell when the battery cell is placed vertically.

[0021] Optionally, the first signal connection piece includes a first body portion and a first connecting portion that are connected to each other, and the positive electrode tab of one battery cell in the middle of the battery cell group and the negative electrode tab of another battery cell are overlapped on the first body portion; an end portion of the first connecting portion is bent toward the BMS board to form a first terminal portion, and the first terminal portion is electrically connected to the BMS board;

[0022] The second signal connection piece includes a second main body portion and a second connecting portion that are connected to each other, and the positive pole tab of another battery cell in the middle of the battery cell group and the negative pole tab of another battery cell are overlapped with each other on the second main body portion; the end of the second connecting portion is bent toward the BMS board to form a second terminal portion, and the second terminal portion is electrically connected to the BMS board.

[0023] Optionally, the first terminal portion and the second terminal portion are both arranged at the other end of the second plate in the first direction and aligned with each other.

[0024] Optionally, the width ratio of the first main body portion to the first connecting portion is K1, 2.5≤K1≤3.5; and / or the width ratio of the second main body portion to the second connecting portion is K2, 2.5≤K2≤3.5.

[0025] Optionally, the total positive BUS includes a total positive body and a total positive lead portion arranged perpendicular to each other, the length direction of the total positive body is arranged along the first direction of the second plate, and the total positive lead portion is arranged along the second direction of the second plate, and the positive electrode tab of a battery cell is overlapped on the total positive body; the end of the total positive lead portion is bent upward to form a total positive terminal portion, and the total positive terminal portion is electrically connected to the BMS board;

[0026] The total negative BUS includes a total negative main body and a total negative lead portion which are arranged perpendicular to each other. The length direction of the total negative main body is arranged along the first direction of the second plate, and the negative electrode tab of a battery cell is overlapped on the total negative main body; the total negative lead portion is arranged along the second direction of the second plate, and the end of the total negative lead portion is bent upward to form a total negative terminal portion, and the total negative terminal portion is electrically connected to the BMS board.

[0027] Optionally, the width ratio of the total positive main body portion to the total positive lead portion is K3, 1≤K3≤1.2; and / or the width ratio of the total negative main body portion to the total negative lead portion is K4, 1≤K4≤1.2.

[0028] Optionally, a connection piece positioning post for positioning the electrical connection piece is further provided on the second plate.

[0029] Optionally, a guide block is further provided on the inner surface of the second plate, and the guide block is provided with two guide surfaces. There is an angle between the two guide surfaces opposite to each other of two adjacent guide blocks, and the distance between the two guide surfaces opposite to each other of two adjacent guide blocks gradually decreases from bottom to top, and the gap between the tops of the two adjacent guide blocks forms the guide groove.

[0030] Optionally, glue reducing holes are provided on both guide surfaces of the guide block.

[0031] Optionally, the cross section of the guide block is an inverted triangle.

[0032] Optionally, two top corners of the upper portion of the inverted triangle are provided with rounded chamfers.

[0033] Optionally, the radius of the fillet is R, and the value of R satisfies 0.2mm≤R≤3mm.

[0034] Optionally, the included angle between the two opposite guide surfaces of two adjacent guide blocks is A, and the value of A satisfies 30°≤A≤85°.

[0035] Optionally, the guide groove has a width of W, and the value of W satisfies: 0.3 mm ≤ W ≤ 3 mm.

[0036] Optionally, the distance between the BMS board and the second board is H2, and the value of H2 satisfies: 1mm≤H2≤10mm.

[0037] Optionally, an insulating layer is provided between the BMS board and the second board.

[0038] The present application also provides a battery, comprising the battery pack structure.

[0039] The battery pack structure provided in the present application has a battery cell tab extending through a guide groove opened on the second plate of the shell, and then the tab is electrically connected to the BMS board above the second plate through an electrical connecting piece arranged between the second plate and the BMS board, thereby saving an adapter board, a signal connector, and some foam materials, which can effectively reduce material costs and improve the space utilization of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0041] FIG1 is a perspective schematic diagram of a battery pack structure provided in an embodiment of the present application;

[0042] FIG2 is an exploded view of a battery pack structure according to an embodiment of the present application;

[0043] FIG3 is a second exploded view of the battery pack structure provided in an embodiment of the present application;

[0044] FIG4 is an enlarged view of the structure within the box in FIG3 ;

[0045] FIG5 is a perspective schematic diagram of a battery pack structure provided by an embodiment of the present application with the BMS board removed;

[0046] FIG6 is a first schematic diagram of a housing provided in an embodiment of the present application;

[0047] FIG7 is a second schematic diagram of a housing provided in an embodiment of the present application;

[0048] FIG8 is a schematic diagram of the total positive BUS provided in an embodiment of the present application;

[0049] FIG9 is a schematic diagram of the total negative BUS provided in an embodiment of the present application;

[0050] FIG10 is a schematic diagram of a first signal connection sheet provided in an embodiment of the present application;

[0051] FIG11 is a schematic diagram of a second signal connection sheet provided in an embodiment of the present application;

[0052] FIG12 is a partial cross-sectional view of a battery pack structure provided in an embodiment of the present application;

[0053] FIG13 is an enlarged view of the cross-sectional portion in FIG12;

[0054] FIG14 is a schematic diagram of the separation of the housing and the telecommunications of the battery pack structure provided in an embodiment of the present application;

[0055] FIG15 is a schematic diagram of the BB section in FIG14;

[0056] FIG16 is an enlarged view of the structure within the box in FIG15 ;

[0057] FIG17 is an enlarged view of the second plate structure in FIG16 .

[0058] Reference numerals: 1, housing; 11, first plate; 12, second plate; 121, guide groove; 13, guide block; 131, glue reduction hole; 132, guide surface; 14, insulation retaining wall; 15, connection piece positioning column; 2, battery cell; 22, tab; 221, positive tab; 222, negative tab; 3, BMS board; 4, electrical connection piece; 41, total positive BUS; 411, total positive body; 412, total positive lead; 413. Main positive terminal; 42. Main negative BUS; 421. Main negative main body; 422. Main negative connection part; 423. Main negative terminal; 43. Signal acquisition connecting piece; 431. First signal connecting piece; 4311. First main body; 4312. First connection part; 4313. First terminal; 432. Second signal connecting piece; 4321. Second main body, 4322. Second connection part, 4323. Second terminal; 5. Foam; 6. Screws. DETAILED DESCRIPTION

[0059] The present application provides a battery pack structure, which provides an electrical connecting plate between the second plate of the shell and the BMS board, and extends the electrode ear from the second plate and electrically connects it to the BMS board above the second plate, thereby saving the adapter plate, signal connector and some foam materials, which can effectively reduce material costs and improve the space utilization of the battery pack.

[0060] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0061] As shown in Figures 1-4, the battery pack structure provided in the present application includes a shell 1, a battery cell group, a BMS board 3 and an electrical connection plate 4. The shell 1 includes a first plate 11 and a second plate 12. The second plate 12 is arranged perpendicular to the first plate 11. In the figure, the second plate 12 is connected to the top of the first plate 11. A plurality of guide grooves 121 are provided on the second plate 12. The battery cell group includes a plurality of battery cells 2. The battery cell group is arranged in the shell 1. Foam 5 is provided between the battery cell group and the shell 1. The tabs 22 of the battery cells 2 pass through the guide grooves 121 and are exposed above the second plate 12. The BMS board 3 is arranged above the second plate 12 and has a gap with the second plate 12. The BMS board 3 is fixed to the support column of the second plate 12 by screws 6.

[0062] The electrical connection piece 4 is provided between the second board 12 and the BMS board 3, and the tab 22 is electrically connected to the BMS board 3 via the electrical connection piece 4. The electrical connection piece 4 is generally made of metal, typically a copper sheet, a nickel sheet, or a plated copper sheet.

[0063] Traditional soft-pack batteries usually have the tabs 22 arranged on the side of the housing 1. That is, the tabs 22 of the battery cell 2 extend from the side of the housing 1, and then the tabs 22 on the side are electrically connected to the BMS board 3 on the top of the housing 1 through an adapter plate. This solution requires the installation of components such as an adapter plate and a signal connector, which not only wastes materials but also results in a waste of space.

[0064] In the present application, an electrical connecting piece 4 is provided between the second plate 12 of the shell 1 and the BMS board 3, and the tab 22 extending from the guide groove 121 of the second plate 12 is electrically connected to the BMS board 3 above the second plate 12, thereby saving the adapter board, signal connector and part of the foam 5 material, which can effectively reduce the material cost and improve the space utilization of the battery pack.

[0065] As shown in Figures 5, 12, and 13, in a preferred embodiment, the electrical connector 4 includes a connector body connected to the tabs 22 of the battery cells 2 and a BMS connection portion connected to the BMS board 3. The connector body is arranged parallel to the upper surface of the second board 12, and the tabs 22 of the battery cells 2 are bent and connected to the upper or lower surface of the connector body. A gap exists between the connector body and the second board 12.

[0066] In the present application, the tab 22 is connected to the electrical connection piece 4 in the following manner: after the tab 22 of the battery cell 2 passes through the housing 1, it is bent onto the upper or lower surface of the electrical connection piece 4 for laser welding. Preferably, in this embodiment, the tab 22 is bent onto the upper surface of the electrical connection piece 4 for laser welding; the electrical connection piece 4 can be placed on the housing 1 or on a jig. After welding, a certain distance is maintained between the electrical connection piece 4 and the housing 1. This distance can be achieved using a jig. This distance can ensure that the tab 22 is not pulled when the battery is subjected to mechanical vibration, thereby improving the mechanical reliability of the battery.

[0067] In a preferred embodiment, the distance between the connecting piece body and the second plate 12 is H1. This distance must meet the battery's requirements for buffering against mechanical vibrations while also preventing the tab 22 from effectively supporting the connecting piece due to an excessively large distance between the connecting piece body and the second plate 12. Therefore, in this embodiment, the value of H1 satisfies the following: 0.3 mm ≤ H1 ≤ 4 mm.

[0068] As shown in FIG5 and FIG8-12 , in a preferred embodiment, the electrical connection piece 4 includes a total positive tab connection piece (total positive BUS) 41 , a total negative tab connection piece (total negative BUS) 42 and a signal acquisition connection piece 43 .

[0069] The positive electrode tab 221 of the battery cell 2 at one end of the battery cell group is electrically connected to the main positive BUS41.

[0070] The positive electrode tab 221 of a battery cell 2 in the middle of the battery cell group is connected to the negative electrode tab 222 of another adjacent battery cell 2 and is electrically connected to a signal acquisition connecting piece 43; that is, the tabs of a battery cell 2 and an adjacent battery cell 2 with different polarities are overlapped and welded to the connecting piece body of the same signal acquisition connecting piece 43.

[0071] The negative electrode tab 222 of the battery cell 2 at the other end of the battery cell group is electrically connected to the main negative BUS42.

[0072] In this way, the tabs 22 of each cell 2 in the cell pack are connected in series via the connector bodies of multiple signal acquisition connectors 43. The BMS connectors of these multiple signal acquisition connectors 43 are then electrically connected to the BMS board 3. The cells 2 at either end of the cell pack each have a positive tab 221 and a negative tab 222 that are electrically connected to the main positive BUS 41 and main negative BUS 42, respectively, to achieve electrical connection to the BMS board 3. The BMS board 3 is soldered to the electrical connectors 4 to achieve electrical continuity.

[0073] The signal acquisition connecting piece 43 includes a first signal connecting piece 431 and a second signal connecting piece 432. The BMS connecting portion of the second signal connecting piece 432 is longer than that of the first signal connecting piece 431, so that the ends of the BMS connecting portions of the first signal connecting piece 431 and the second signal connecting piece 432 converge on the same side of the battery cell 2, and are then neatly and uniformly connected to one side of the BMS board 3.

[0074] The total positive BUS 41 and the total negative BUS 42 are correspondingly arranged on the other side of the BMS board 3 .

[0075] After the main positive BUS 41 and the adjacent signal collection connecting piece 43 are welded to the corresponding tabs 22 , the distance between the two is small. If vibration occurs, they may contact each other and cause a short circuit.

[0076] In order to avoid the above situation, as shown in Figures 5-6, in a preferred embodiment, an insulating barrier wall 14 is provided between the total positive BUS41 and the total negative BUS42 and the adjacent signal acquisition connecting piece 43, respectively. The insulating barrier wall 14 can separate the total positive BUS41 and the positive pole tab 221 welded thereon from the adjacent signal acquisition connecting piece 43 and the positive pole tab 221 and the negative pole tab 222 welded thereon. Similarly, the insulating barrier wall 14 can separate the total negative BUS41 and the negative pole tab 222 welded thereon from the adjacent signal acquisition connecting piece 43 and the positive pole tab 221 and the negative pole tab 222 welded thereon, thereby preventing the tabs 22 of the battery cells 2 connected to the total positive BUS41 and the total negative BUS42 from contacting other tabs 22 and causing a short circuit risk.

[0077] As shown in FIG5 , in a preferred embodiment, the first direction of the second plate 12 is parallel to the length direction of the battery cell (when the battery cell is placed vertically), and the battery cells 2 of the battery cell group are arranged along a second direction perpendicular to the first direction.

[0078] The signal acquisition connection piece 43 includes a first signal connection piece 431 and a second signal connection piece 432. The first signal connection piece 431 is evenly arranged at one end of the second board 12 in the first direction. The total positive BUS 41, the second signal connection piece 432, and the total negative BUS 42 are evenly arranged in sequence at the other end of the second board 12 in the first direction.

[0079] Specifically, as shown in Figure 5, the right side of the figure is one end of the second board 12 in the first direction, and the four first signal connection pads 431 are arranged on this side. The left side of the figure is the other end of the second board in the first direction, and from top to bottom are the main positive BUS 41, the three second signal connection pads 432, and the main negative BUS 42.

[0080] The first signal connection piece 431 , the second signal connection piece 432 , the main positive BUS 41 and the main negative BUS 42 are all positioned in the grooves on the outer surface of the second board.

[0081] In this way, the first signal connection piece 431 , the second signal connection piece 432 , the total positive BUS 41 and the total negative BUS 42 are rationally arranged, which can maximize the use of the space between the second board 12 and the BMS board 3 .

[0082] In a preferred embodiment, as shown in Figures 5, 10, and 11, the first signal connection piece 431 includes a first body portion 4311 and a first connecting portion 4312 that are interconnected. The width of the first body portion 4311 is greater than that of the first connecting portion 4312. The positive electrode tab 221 of one battery cell and the negative electrode tab 222 of another battery cell overlap each other on the wider first body portion 4311. The end of the first connecting portion 4312 is bent toward the BMS board 3 to form a first terminal portion 4313, which is intended to electrically connect to the BMS board 3.

[0083] Similarly, the second signal connection piece 432 includes a second body portion 4321 and a second connecting portion 4322 that are interconnected. The width of the second body portion 4321 is greater than the width of the second connecting portion 4322. The positive electrode tab 221 of one battery cell 2 and the negative electrode tab 222 of another battery cell 2 overlap each other on the wider second body portion 4321. The end of the second connecting portion 4322 is bent toward the BMS board to form a second terminal portion 4323, which is electrically connected to the BMS board 3.

[0084] Thus, the wider first body portion 4311 and the second body portion 4321 are used to support and electrically connect to the tab 22 of the battery cell 2. The narrower first lead portion 4312 and the second lead portion 4322 realize the electrical connection between the tab 22 of the battery cell 2 and the BMS battery protection board 3.

[0085] In a preferred embodiment, as shown in FIG5 , to rationally utilize space, the first terminal portion 4313 and the second terminal portion 4323 are both disposed at one end of the second board 12 in the first direction and aligned with each other. This allows the first signal connection piece 431 and the second signal connection piece 432 to be located on the same side as the connection terminals of the BMS board, facilitating the design and layout of the BMS board's internal circuitry.

[0086] In a preferred embodiment, in order to ensure that the widths of the first main body portion 4311 and the second main body portion 4321 are sufficient to effectively support the electrode tab 22, and that the widths of the first connecting portion 4312 and the second connecting portion 4322 can meet the purpose of signal transmission, the width ratio of the first main body portion 4311 and the first connecting portion 4312 is K1, and the width ratio of the second main body portion 4321 and the second connecting portion 4322 is K2, and K1 and K2 satisfy: 2.5≤K1≤3.5, 2.5≤K2≤3.5.

[0087] In a preferred embodiment, as shown in Figures 5, 8, and 9, the main positive BUS 41 includes a main positive body 411 and a main positive lead 412, which are arranged perpendicular to each other. The main positive body 411 is longitudinally arranged along the first direction of the second plate 12, and the positive electrode tab 221 of a battery cell 2 is overlapped with the main positive body 411. The main positive lead 412 is arranged along the second direction of the second plate 12. The end of the main positive lead 412 is bent upward to form a main positive terminal 413, which is electrically connected to the BMS board 3.

[0088] The main negative BUS 42 includes a main negative body 421 and a main negative lead 422, which are arranged perpendicular to each other. The main negative body 421 is oriented longitudinally along the first direction of the second plate 12, and the negative electrode tab 222 of a battery cell 2 is attached to the main negative body 421. The main negative lead 422 is oriented along the second direction of the second plate 12. The end of the main negative lead 422 is bent upward to form a main negative terminal 423, which is electrically connected to the BMS board 3.

[0089] Specifically, as shown in Figure 5, the length of the total positive lead portion 412 is perpendicular to the length of the total positive body portion 411. The end of the total positive lead portion 412 bends upward near the upper edge of the second plate 12 to form the total positive terminal portion 413. The length of the total negative lead portion 422 is perpendicular to the length of the total negative body portion 421. The end of the total negative lead portion 422 bends upward near the lower edge of the second plate 12 to form the total negative terminal portion 423. In this way, the total positive terminal portion 413 and the total negative terminal portion 423 are positioned as close as possible to the upper and lower edges of the second plate 12 to avoid interference with other components.

[0090] In a preferred embodiment, in order to ensure that the widths of the total positive main body 411 and the total negative main body 421 are sufficient to effectively support the electrode tab 2, and that the widths of the total positive lead portion 412 and the total negative lead portion 422 can meet the requirements of electrical connection, the width ratio of the total positive main body 411 to the total positive lead portion 412 is K3, and the width ratio of the total negative main body 421 to the total negative lead portion 422 is K4, and K3 and K4 satisfy: 1≤K3≤1.2, 1≤K4≤1.2.

[0091] As shown in Figures 5-6, in a preferred embodiment, the second plate 12 is further provided with connecting piece positioning posts 15 for positioning the electrical connecting piece 4. Accordingly, the electrical connecting piece 4 is provided with positioning holes, and each connecting piece positioning post 15 is respectively inserted into the positioning hole of each electrical connecting piece 4, thereby quickly positioning each electrical connecting piece 4 on the second plate 12.

[0092] As shown in Figures 7 and 12-17, in a preferred embodiment, the inner surface of the second plate 12 is further provided with a plurality of guide blocks 13, each of which has two guide surfaces 132. An angle exists between the opposing guide surfaces 132 of two adjacent guide blocks 13, and the spacing between the opposing guide surfaces 132 of two adjacent guide blocks 13 gradually decreases from bottom to top. The gap between the tops of two adjacent guide blocks 13 forms a guide groove 121.

[0093] The length direction of the guide groove 121 is consistent with the width direction of the tab 22 , so that the tab 22 can be inserted from below the guide groove 121 and pass through the outer surface of the second plate 12 .

[0094] The guide block 13 and the guide groove 121 formed therewith are used to provide guidance for the insertion of the battery cell assembly tab 22 , thereby facilitating the assembly process and improving assembly efficiency.

[0095] As shown in FIG. 3-7 , in a preferred embodiment, in order to meet the requirement of uniform thickness of each wall surface of the housing 1 , both guide surfaces 132 of the guide block 13 are provided with glue reducing holes 131 .

[0096] As shown in Figures 12-17, in a preferred embodiment, the cross section of the guide block 13 is an inverted triangle.

[0097] The guide block 13 with an inverted triangular cross section has a simple structure. The two surfaces of the adjacent guide blocks 13 can meet the requirement that the tab 22 reaches the guide groove 121 between the two guide surfaces 132 when plugging and unplugging, and is easy to process.

[0098] As shown in Figures 12-17, in a preferred embodiment, the two top corners of the inverted triangle are rounded. The rounded corners of the two top corners of the inverted triangle are conducive to dispersing stress when the tab 22 is inserted into or removed from the guide groove 121, that is, when it is pulled against the second plate 12, and have a certain effect on preventing the tab 22 from breaking.

[0099] As shown in FIG17 , in a preferred embodiment, the radius of the fillet is R. If the radius R is too large or too small, it will not ensure the smooth introduction of the tab 22. Therefore, in order to ensure the smooth introduction of the tab 22, in this embodiment, the value of R satisfies 0.2 mm ≤ R ≤ 3 mm.

[0100] As shown in Figure 17, in a preferred embodiment, the angle between the two opposing guide surfaces 132 of two adjacent guide blocks 13 is A. A cannot be too small, otherwise the tab 22 cannot pass smoothly through. If it is too large, the tab 22 cannot be constrained and guided. To ensure smooth guidance of the tab 22 into the guide groove 121, in this embodiment, the value of A satisfies 30°≤A≤85°.

[0101] As shown in FIG17 , in a preferred embodiment, the width of the guide slot 121 is W. W cannot be too small, otherwise the tab 22 cannot be smoothly inserted into the guide slot 121. A too large width can affect the placement and installation of the electrical connection plate 4. To ensure smooth insertion of the tab 22 into the guide slot 121 and facilitate overall installation, in this embodiment, the value of W satisfies the following: 0.3 mm ≤ W ≤ 3 mm.

[0102] In a preferred embodiment, the distance between the BMS board 3 and the second board 12 is H2. In order to meet the insulation performance requirements of the BMS board 3 and each electrical connection piece 4, the value of H2 satisfies: 1mm≤H2≤10mm.

[0103] Furthermore, an insulating layer is provided between the BMS board 3 and the second board 12 to improve the insulation performance of the BMS board 3 and each electrical connection piece 4 to avoid short circuit.

[0104] The present application also provides a battery that uses the above-mentioned battery pack structure.

[0105] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0106] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the word "or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0107] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed or recombined, and such decomposition or recombination should be regarded as equivalent solutions of the present application.

[0108] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0109] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly illustrate the technical solutions and cannot be used to limit the scope of protection of the present application.

[0110] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A battery pack structure, characterized in that: include: The housing comprises a first plate and a second plate, wherein the second plate is arranged perpendicular to the first plate and a plurality of guide grooves are formed on the second plate; A battery cell group, comprising a plurality of battery cells, wherein the battery cell group is arranged in the housing, and the tabs of the battery cells pass through the guide grooves and are exposed on the outer surface of the second plate; A battery management system (BMS) battery protection board, arranged in parallel outside the second board and having a gap with the second board; An electrical connection sheet is provided between the second board and the BMS board, and the tab is electrically connected to the BMS board via the electrical connection sheet.

2. The battery pack structure according to claim 1, characterized in that: The electrical connecting sheet includes a connecting sheet body connected to the tabs of the battery cell and a BMS connecting portion connected to the BMS board. The connecting sheet body is arranged parallel to the upper surface of the second board. The tabs of the battery cell are bent and connected to the upper surface or lower surface of the connecting sheet body. There is a gap between the connecting sheet body and the second board.

3. The battery pack structure according to claim 2, characterized in that: The distance between the connecting piece body and the second plate is H1, and the value of H1 satisfies: 0.3mm≤H1≤4mm.

4. The battery pack structure according to any one of claims 1 to 3, characterized in that: The electrical connection piece includes a total positive pole ear connection piece (total positive BUS), a total negative pole ear connection piece (total negative BUS) and a signal collection connection piece; The positive electrode tab of a battery cell at one end of the battery cell group is electrically connected to the total positive BUS; The positive electrode tab of a cell in the middle of the cell group is connected to the negative electrode tab of another adjacent cell and is electrically connected to one of the signal acquisition connection sheets; The negative electrode tab of a cell at the other end of the cell group is electrically connected to the total negative BUS.

5. The battery pack structure according to claim 4, characterized in that: An insulating barrier is provided between the total positive BUS and / or the total negative BUS and the adjacent signal acquisition connecting piece.

6. The battery pack structure according to claim 4 or 5, characterized in that: The cells of the cell group are arranged along a second direction perpendicular to the first direction; The signal acquisition connecting piece includes a first signal connecting piece and a second signal connecting piece, and the first signal connecting piece is evenly arranged at one end of the first direction of the second board; the total positive BUS, the second signal connecting piece and the total negative BUS are respectively evenly distributed at the other end of the first direction of the second board, wherein the first direction of the second board is a direction parallel to the length direction of the battery cell when the battery cell is placed vertically.

7. The battery pack structure according to claim 6, characterized in that: The first signal connection sheet includes a first main body portion and a first connecting portion connected to each other, the positive electrode tab of one battery cell in the middle of the battery cell group and the negative electrode tab of another battery cell are overlapped on the first main body portion; the end of the first connecting portion is bent toward the direction of the BMS board to form a first terminal portion, and the first terminal portion is electrically connected to the BMS board; The second signal connecting piece includes a second main body portion and a second connecting portion which are connected to each other, and the positive pole tab of another battery cell in the middle of the battery cell group and the negative pole tab of another battery cell are overlapped with each other on the second main body portion; the end of the second connecting portion is bent toward the BMS board to form a second terminal portion, and the second terminal portion is electrically connected to the BMS board.

8. The battery pack structure according to claim 7, characterized in that: The first terminal portion and the second terminal portion are both disposed at the other end of the second plate in the first direction and aligned with each other.

9. The battery pack structure according to claim 7 or 8, characterized in that: The width ratio of the first main body portion to the first guide portion is K1, 2.5≤K1≤3.5; and / or A width ratio between the second main body portion and the second guide portion is K2, 2.5≤K2≤3.

5.

10. The battery pack structure according to any one of claims 6 to 9, characterized in that: The total positive BUS comprises a total positive main body and a total positive lead portion which are arranged perpendicularly to each other, the length direction of the total positive main body is arranged along the first direction of the second board, the positive pole ear of a battery cell is overlapped on the total positive main body, the total positive lead portion is arranged along the second direction of the second board, the end of the total positive lead portion is bent upward to form a total positive terminal portion, and the total positive terminal portion is electrically connected to the BMS board; The total negative BUS includes a total negative main body and a total negative lead portion which are arranged perpendicular to each other. The length direction of the total negative main body is arranged along the first direction of the second plate. The negative pole tab of a battery cell is overlapped on the total negative main body. The total negative lead portion is arranged along the second direction of the second plate. The end of the total negative lead portion is bent upward to form a total negative terminal portion, and the total negative terminal portion is electrically connected to the BMS board.

11. The battery pack structure according to claim 10, characterized in that: The width ratio of the total positive body portion to the total positive guide portion is K3, 1≤K3≤1.2; and / or The width ratio of the total negative main body portion to the total negative connecting portion is K4, 1≤K4≤1.

2.

12. The battery pack structure according to any one of claims 1 to 11, characterized in that: The second plate is also provided with a connection piece positioning column for positioning the electrical connection piece.

13. The battery pack structure according to any one of claims 1 to 12, characterized in that: A guide block is also provided on the inner surface of the second plate, and the guide block is provided with two guide surfaces. There is an angle between the two guide surfaces opposite to each other of two adjacent guide blocks, and the distance between the two guide surfaces opposite to each other of two adjacent guide blocks gradually decreases from bottom to top, and the gap between the two adjacent guide blocks forms the guide groove.

14. The battery pack structure according to claim 13, characterized in that: The cross section of the guide block is an inverted triangle.

15. The battery pack structure according to claim 14, characterized in that: Two apex corners of the upper part of the inverted triangle are provided with rounded corners.

16. The battery pack structure according to claim 15, characterized in that: The radius of the round chamfer is R, and the value of R satisfies 0.2mm≤R≤3mm.

17. The battery pack structure according to any one of claims 13 to 16, characterized in that: The included angle between the two opposite guide surfaces of two adjacent guide blocks is A, and the value of A satisfies 30°≤A≤85°.

18. The battery pack structure according to any one of claims 1 to 17, characterized in that: The width of the guide groove is W, and the value of W satisfies: 0.3mm≤W≤3mm.

19. The battery pack structure according to any one of claims 1 to 18, characterized in that: The distance between the BMS board and the second board is H2, and the value of H2 satisfies: 1mm≤H2≤10mm.

20. A battery, characterized in that: Comprising a battery pack structure as described in any one of claims 1-19.

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