Battery pack

Abstract

The utility model relates to battery technology field discloses battery package, include: casing, the electric core module includes a plurality of electric core, a plurality of electric core is along X direction and is side by side arranged in the inner chamber of casing, the top surface of each electric core is provided with a pair of pole post that interval arrangement along Y direction, and the radial outer periphery of pole post is equipped with assembly slot, the busbar support is equipped with the through -hole that corresponds with the pole post of all electric core one to one, and the busbar support is covered in the top surface of electric core module through the through -hole one to one and is correspondingly worn in pole post, the inter -cell busbar includes the busbar body and the interval arrangement a pair of first mounting hole that are equipped on the busbar body, along Z direction, the thickness T of busbar body and the height H of assembly slot are matched, along X direction, and the inter -cell busbar is connected with pole post interference fit through a pair of first mounting hole and is arranged in the assembly slot of adjacent pole post of adjacent electric core. Such setting can avoid the adverse problems such as virtual welding, explosion point caused by unstable welding technology, and the quality stability of battery package is improved.

Description

Technical Field

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

[0002] With the rapid popularization of new energy vehicles, power battery technology is becoming increasingly mature. Currently, battery cells in a battery pack are often connected in series via busbars, which are typically connected to the cell terminals using laser welding. The busbars are then fixed to the busbar bracket via thermal riveting.

[0003] However, current laser welding technology is unstable, and there are problems such as incomplete welding and explosions during the welding process. These problems can lead to increased connection resistance between the battery cell and the busbar, affecting the stable transmission of current, and may even cause local overheating due to poor contact, posing a safety hazard. Utility Model Content

[0004] In view of this, the present invention provides a battery pack to solve the problem of connection defects between the busbar and the cell terminal caused by the instability of current laser welding technology.

[0005] This utility model provides a battery pack, comprising:

[0006] The housing has an opening and an inner cavity communicating with the opening;

[0007] A battery cell module includes multiple battery cells arranged side-by-side in the inner cavity of the housing along the X direction. Each battery cell has a pair of terminals spaced apart on its top surface along the Y direction, and the terminals have an assembly groove on their radial outer periphery.

[0008] The busbar bracket is provided with through holes corresponding to the terminals of all the battery cells. The busbar bracket passes through the through holes and covers the top surface of the battery cell module.

[0009] A busbar between battery cells includes a busbar body and a pair of first mounting holes spaced apart on the busbar body. Along the Z direction, the thickness T of the busbar body matches the height H of the mounting groove.

[0010] Along the X direction, the inter-cell busbar is fitted into the assembly groove of the adjacent terminal of the adjacent cell through a pair of first mounting holes and is connected to the terminal with an interference fit.

[0011] Beneficial Effects: This utility model features a first mounting hole on the inter-cell busbar and an assembly groove extending circumferentially on the terminal post. The thickness of the busbar body matches the height of the assembly groove, allowing the inter-cell busbar to form a stable interference fit with the assembly groove of the adjacent terminal post through the first mounting hole. This design not only ensures the connection stability between the terminal post and the inter-cell busbar but also ensures sufficient contact between them, guaranteeing that the actual contact area meets design requirements. This effectively reduces contact resistance, improves conductivity and current carrying capacity, and reduces problems such as localized heating and energy loss caused by poor contact. Therefore, the inter-cell busbar of this utility model, fitted into the assembly groove of the terminal post through the first mounting hole and connected with the terminal post through an interference fit, effectively avoids defects such as incomplete welds and spalling caused by unstable laser welding technology during the welding process at the connection point between the terminal post and the busbar in conventional technologies, thus improving the quality stability of the battery pack.

[0012] In one alternative embodiment, along the Z direction, the outer edge of the top surface of the pole post is provided with a first rounded corner, and the bottom of the inner wall of the busbar body located in the first mounting hole is provided with a second rounded corner.

[0013] Beneficial effects: By utilizing the first rounded corner on the top surface of the terminal and the second rounded corner at the first mounting hole of the busbar body, a smooth guiding fit can be formed during the assembly process of the busbar and terminal between the cells, reducing the difficulty of the assembly operation and making the assembly between the busbar and terminal between the cells smoother, reducing component wear caused by rigid mating. In addition, placing the second rounded corner at the bottom of the inner wall of the first mounting hole can improve the fit between the top surface of the first mounting hole of the busbar body and the groove wall of the assembly groove, thereby ensuring the reliability of the connection between the two.

[0014] In one alternative embodiment, along the Z-direction, the bottom surface of the busbar bracket is glued to the top surface of the battery cell module, and the inter-cell busbar is glued to the top surface of the busbar bracket.

[0015] Beneficial effects: This utility model adopts an adhesive bonding method, which can form a uniform and firm connection between the busbar bracket and the battery cell module, and between the busbars between the battery cells and the busbar bracket, avoiding problems such as excessively large hot riveting head area and insufficient hot riveting height that may occur during the hot riveting process; at the same time, the adhesive bonding operation does not require complex heat processing equipment, which simplifies the production process and reduces the quality risks caused by fluctuations in process parameters.

[0016] In one alternative embodiment, along the X direction, the busbar bracket has a downwardly bent groove between every two adjacent terminals, and the bottom surface of the groove is glued to the top surface of the cell module.

[0017] Beneficial Effects: Although the busbar and terminals in this invention are interference-fitted, a certain amount of swaying may occur during assembly, use, or transportation. Therefore, this invention addresses this by providing downward-bent grooves between every two adjacent terminals of the busbar bracket. This creates a gap between the busbar bracket and the top surface of the battery module at the terminal, allowing the deformation of the busbar bracket at this point to absorb the aforementioned swaying. Furthermore, the bottom surface of the grooves is glued to the top surface of the battery module, ensuring a secure connection between the busbar bracket and the battery module and preventing relative displacement between them.

[0018] In one alternative embodiment, a flexible printed circuit board is also included, which is adhesively bonded to the top surface of the bus support and located between two opposing rows of cell-to-cell buses.

[0019] Beneficial effects: Connecting the flexible printed circuit board (PCB) to the busbar bracket using adhesive bonding ensures a secure connection while reducing operational difficulty and improving assembly efficiency. Secondly, placing the PCB between the busbars of two opposing rows of cells optimizes the use of internal space in the battery pack, improving space utilization. Furthermore, it prevents direct contact or friction between the PCB and the busbars, enhancing the overall safety and reliability of the battery pack.

[0020] In one alternative embodiment, along the Y direction, the cell busbar has an upwardly bent protrusion at the portion between a pair of first mounting holes;

[0021] It also includes voltage detection pieces that correspond one-to-one with the protrusions. One end of the voltage detection piece is fixed to the top surface of the protrusion, and the other end is electrically connected to the flexible printed circuit board.

[0022] The flexible printed circuit board has meandering slots on opposite sides of the voltage detection piece.

[0023] Beneficial effects: The upward bending protrusion of the busbar between battery cells provides an independent and stable mounting point for the voltage detection chip, facilitating precise docking between the chip and the busbar to obtain accurate voltage signals, while reducing interference between the chip and other components due to the height difference. Secondly, the voltage detection chip stably transmits the battery cell voltage signal to the flexible printed circuit board, enabling real-time monitoring of the battery cell status. Furthermore, the meandering slots on the flexible printed circuit board provide a buffer space at the connection point between the voltage detection chip and the circuit board, absorbing stress caused by vibration and deformation during assembly, use, or transportation. This prevents the connection between the voltage detection chip and the flexible printed circuit board from breaking due to pulling, thus improving the reliability of the detection structure.

[0024] In one alternative embodiment, the flexible printed circuit board includes two sub-circuit boards, with one end of the voltage detection piece electrically connected to the flexible printed circuit board inserted and bonded between the two sub-circuit boards.

[0025] Beneficial effects: The connection method of inserting and bonding the voltage detection piece between two sub-circuit boards in this utility model can increase the contact area between the detection piece and the circuit board. This not only makes the electrical connection more stable and reliable and reduces the contact resistance to ensure the accuracy of voltage signal transmission, but also forms a firm mechanical fixation for the detection piece through the clamping and bonding of the two sub-circuit boards, effectively resisting the risk of falling off caused by external forces such as vibration and impact.

[0026] In one alternative embodiment, the protrusion is provided corresponding to the groove.

[0027] Beneficial effects: The corresponding arrangement of protrusions and grooves allows the structure of the busbar between cells to be adapted to the layout of the busbar support, ensuring the compactness of the internal structure of the battery pack.

[0028] In one optional embodiment, an output bus is further included, the output bus including a body and a second mounting hole on the body and an output electrode plate extending from one end of the body along the X direction, the output electrode plate being fixed to the top surface of the housing by a snap-fit ​​structure; the body is fitted into the assembly groove through the second mounting hole and is interference-fitted with the corresponding electrode post.

[0029] Beneficial effects: The body of the output busbar can form a stable connection with the corresponding terminal through the second mounting hole, ensuring smooth current output; the design of the output plate extending in the X direction can make reasonable use of the internal space of the battery pack and avoid layout conflicts with other components inside the battery pack; the output plate is fixed to the top surface of the housing by a snap-fit ​​structure, which not only makes the connection firm and can effectively resist the influence of external forces such as vibration and impact, ensuring the stability of the overall structure of the output busbar, but also simplifies the assembly process and facilitates later maintenance and repair.

[0030] In one optional embodiment, the snap-fit ​​structure includes a slot with barbs inside, and the output electrode plate is inserted into the slot and abuts against the barbs.

[0031] Beneficial effects: This invention inserts the output electrode plate into the slot, preventing relative rotation between the output electrode busbar and the corresponding electrode post under vibration, impact, or other operating conditions. Furthermore, the barbed structure within the slot increases the friction between the output electrode plate and the slot, reducing the possibility of the output electrode plate detaching from the slot. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present utility model;

[0034] Figure 2 This is a top view of a battery pack according to an embodiment of the present utility model;

[0035] Figure 3 for Figure 2 A schematic diagram of the structure from the perspective of AA;

[0036] Figure 4 for Figure 3 A magnified view of part M in the diagram;

[0037] Figure 5 This is a side view of a battery pack according to an embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Housing; 101. Slot; 2. Cell module; 201. Cell; 202. Terminal post; 2021. Assembly slot; 2022. First rounded corner; 3. Busbar bracket; 301. Groove; 4. Inter-cell busbar; 401. Busbar body; 402. Second rounded corner; 403. Protrusion; 5. Flexible printed circuit board; 501. Slot; 502. Sub-circuit board; 6. Voltage detection piece; 7. Output busbar; 701. Body; 702. Output plate. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] To address the problem of connection defects between the busbar and the cell terminal caused by the instability of current laser welding technology, this utility model provides a battery pack.

[0042] The following is combined with Figures 1 to 5The following describes embodiments of the present invention.

[0043] According to an embodiment of the present invention, a battery pack is provided, such as... Figures 1 to 4 As shown, it includes: housing 1, cell module 2, busbar bracket 3 and cell busbar 4.

[0044] Specifically, the housing 1 has an opening and an inner cavity communicating with the opening; the battery cell module 2 includes multiple battery cells 201, which are arranged side by side in the inner cavity of the housing 1 along the X direction. The top surface of each battery cell 201 has a pair of terminals 202 spaced apart along the Y direction, and the radial outer periphery of the terminals 202 has an assembly groove 2021; the busbar bracket 3 has through holes corresponding to the terminals 202 of all the battery cells 201, and the busbar bracket 3 passes through the through holes one by one. The terminal post 202 covers the top surface of the cell module 2; the inter-cell busbar 4 includes a busbar body 401 and a pair of first mounting holes spaced apart on the busbar body 401. Along the Z direction, the thickness T of the busbar body 401 matches the height H of the mounting groove 2021; along the X direction, the inter-cell busbar 4 is fitted into the mounting groove 2021 of the adjacent terminal post 202 of the adjacent cell 201 through the pair of first mounting holes and is interference-fitted with the terminal post 202.

[0045] This embodiment of the invention provides a first mounting hole on the inter-cell busbar 4 and an assembly groove 2021 extending circumferentially on the terminal post 202. The thickness of the busbar body 401 is matched with the height of the assembly groove 2021, allowing the inter-cell busbar 4 to form a stable interference fit with the assembly groove 2021 of the adjacent terminal post 202 through the first mounting hole. This design not only ensures the connection stability between the terminal post 202 and the inter-cell busbar 4 but also ensures sufficient contact between them, guaranteeing that the actual contact area meets design requirements. This effectively reduces the contact resistance, improves conductivity and current carrying capacity, and reduces problems such as localized heating and energy loss caused by poor contact. As can be seen, in this embodiment of the present invention, the inter-cell busbar 4 is fitted into the assembly groove 2021 of the terminal post 202 through the first mounting hole and is connected to the terminal post 202 with an interference fit. This can effectively avoid the problems such as false welding and explosion caused by the instability of laser welding technology at the connection between the terminal post 202 and the busbar in conventional technical solutions, thereby improving the quality stability of the battery pack.

[0046] Specifically, this embodiment provides an opening on the housing 1 that communicates with its internal cavity, facilitating the assembly of the battery cell module 2 into the housing 1 and improving the convenience and ease of assembly. In this embodiment, one of the pair of terminals 202 on the top surface of any battery cell 201 is a positive terminal 202, and the other is a negative terminal 202. Therefore, depending on the design requirements of series or parallel connection, the polarities of adjacent terminals 202 of adjacent battery cells 201 connected by the inter-cell busbar 4 can be the same or different. That is, the two terminals 202 connected by the inter-cell busbar 4 can be one positive terminal and one negative terminal, or two positive terminals or two negative terminals. In this embodiment, the busbar support 3 is usually made of insulating material, so placing it between the busbar and the top surface of the battery cell module 2 can prevent short circuits between the busbar and the structure on the top surface of the battery cell module 2. Secondly, the busbar bracket 3 is installed through the through holes and correspondingly installed on the top surface of the cell module 202. This can achieve precise positioning and reduce the difficulty of assembly. On the other hand, it can prevent the position of the busbar bracket 3 from shifting during battery pack assembly or use, ensuring that it can always effectively play its role in insulation and isolation.

[0047] Furthermore, this embodiment of the invention does not impose any particular limitation on the type or shape of the battery cell 201, which can be various types of battery cells 201, such as blade cells or square cells. The battery cell 201 in this embodiment of the invention can be a lithium-ion cell, a potassium-ion cell, a sodium-ion cell, a lithium-sulfur cell, etc., and is particularly preferred to be a lithium-ion cell.

[0048] According to one embodiment of the present invention, such as Figure 3 and Figure 4 As shown, along the Z-direction, the outer edge of the top surface of the terminal post 202 is provided with a first rounded corner 2022, and the bottom of the inner wall of the bus body 401 at the first mounting hole is provided with a second rounded corner 402. It can be understood that, with the help of the first rounded corner 2022 on the top surface of the terminal post 202 and the second rounded corner 402 at the first mounting hole of the bus body 401, a smooth guiding fit can be formed during the assembly process of the inter-cell bus 4 and the terminal post 202, reducing the difficulty of the assembly operation and making the assembly between the inter-cell bus 4 and the terminal post 202 smoother, reducing component wear caused by rigid contact. Furthermore, placing the second rounded corner 402 at the bottom of the inner wall of the first mounting hole can improve the fit between the top surface of the bus body 401 at the first mounting hole and the groove wall of the assembly groove 2021, thereby ensuring the reliability of the connection between the two.

[0049] In conventional designs, the inter-cell busbar 4 is typically connected to the busbar bracket 3 via thermal riveting. However, thermal riveting technology also suffers from instability, with defects such as excessively large riveting head area and insufficient riveting height, which can easily lead to loosening or damage of the connection, affecting the stability of the battery pack.

[0050] Based on this, according to one embodiment of the present invention, such as Figure 1 and Figure 3 As shown, along the Z-direction, the bottom surface of the busbar bracket 3 is glued to the top surface of the cell module 2, and the inter-cell busbar 4 is glued to the top surface of the busbar bracket 3. This embodiment of the invention uses adhesive bonding, which enables a uniform and secure connection between the busbar bracket 3 and the cell module 2, and between the inter-cell busbar 4 and the busbar bracket 3. This avoids problems such as excessively large hot riveting head area and insufficient hot riveting height that may occur during hot riveting. Furthermore, adhesive bonding eliminates the need for complex heat treatment equipment, simplifying the production process and reducing quality risks caused by fluctuations in process parameters.

[0051] Specifically, in this embodiment, the busbar bracket 3 is connected to the top surface of the battery cell module 2 and the inter-cell busbar 4 via double-sided adhesive. For example, adhesive is applied to the side of the inter-cell busbar 4 facing the busbar bracket 3, and then the busbar bracket 3 is connected to the inter-cell busbar 4 using double-sided adhesive.

[0052] Furthermore, the aforementioned double-sided adhesive can be, but is not limited to, acrylic double-sided adhesive, silicone double-sided adhesive, and polyimide (PI) based double-sided adhesive. This utility model does not impose specific limitations in this regard.

[0053] According to one embodiment of the present invention, such as Figure 1 and Figure 2 As shown, along the X direction, the busbar bracket 3 has a downwardly bent groove 301 between every two adjacent terminals 202. The bottom surface of the groove 301 is glued to the top surface of the cell module 2. It can be understood that although the inter-cell busbar 4 and terminals 202 in this embodiment are interference-fitted, a certain amount of shaking will occur during assembly, use, or transportation. Therefore, by providing a downwardly bent groove 301 between every two adjacent terminals 202 in this embodiment, a gap is left between the busbar bracket 3 and the top surface of the cell module 2 at the terminals 202. This allows the deformation of the busbar bracket 3 at this location to absorb the aforementioned shaking. Furthermore, the bottom surface of the groove 301 is glued to the top surface of the cell module 2, ensuring a firm connection between the busbar bracket 3 and the cell module 2 and preventing relative displacement between them.

[0054] It should be noted that the shaking in this embodiment is not limited to a single direction, but can occur in multiple directions.

[0055] According to one embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the battery pack also includes a flexible printed circuit board 5, which is glued to the top surface of the busbar support 3 and located between the two opposing rows of cell busbars 4. It can be understood that using adhesive bonding to connect the flexible printed circuit board 5 to the busbar support 3 ensures a secure connection while reducing operational difficulty and improving assembly efficiency. Furthermore, placing the flexible printed circuit board 5 between the two opposing rows of cell busbars 4 allows for efficient use of the battery pack's internal space, improving space utilization; it also prevents direct contact or friction between the flexible printed circuit board 5 and the cell busbars 4, enhancing the overall safety and reliability of the battery pack.

[0056] According to one embodiment of the present invention, such as Figure 1 and Figure 2 As shown, along the Y direction, the inter-cell busbar 4 has an upwardly bent protrusion 403 between a pair of first mounting holes, and also includes a voltage detection piece 6 corresponding to each protrusion 403. One end of the voltage detection piece 6 is fixed to the top surface of the protrusion 403, and the other end is electrically connected to the flexible printed circuit board 5. The flexible printed circuit board 5 has meandering slots 501 on opposite sides of the voltage detection pieces 6. Specifically, the upwardly bent protrusion 403 of the inter-cell busbar 4 provides an independent and stable mounting point for the voltage detection piece 6, which facilitates precise docking of the detection piece with the inter-cell busbar 4 to obtain an accurate voltage signal, and reduces interference between the detection piece and other components through the height difference. Secondly, the voltage detection piece 6 stably transmits the voltage signal of the cell 201 to the flexible printed circuit board 5, enabling real-time monitoring of the status of the cell 201. The meandering slots 501 on the flexible printed circuit board 5 provide a buffer space for the connection between the voltage detection piece 6 and the circuit board. This can absorb the stress caused by vibration and deformation during assembly, use, or transportation, and prevent the connection between the voltage detection piece 6 and the flexible printed circuit board 5 from breaking due to pulling, thus improving the reliability of the detection structure.

[0057] According to one embodiment of the present invention, such as Figure 1 and Figure 2As shown, the flexible printed circuit board 5 includes two sub-circuit boards 502. One end of the voltage detection piece 6, which is electrically connected to the flexible printed circuit board 5, is inserted and bonded between the two sub-circuit boards 502. This embodiment of the invention, by inserting and bonding the voltage detection piece 6 between the two sub-circuit boards 502, increases the contact area between the detection piece and the circuit board. This not only makes the electrical connection more stable and reliable, reducing contact resistance to ensure the accuracy of voltage signal transmission, but also, through the clamping and bonding of the two sub-circuit boards 502, forms a strong mechanical fixation for the detection piece, effectively resisting the risk of detachment caused by external forces such as vibration and impact.

[0058] According to one embodiment of the present invention, such as Figures 1 to 3 As shown, the protrusion 403 and the groove 301 are correspondingly arranged. Specifically, the corresponding arrangement of the protrusion 403 and the groove 301 can make the structure of the inter-cell busbar 4 and the layout of the busbar bracket 3 more compatible, ensuring the compactness of the internal structure of the battery pack.

[0059] According to one embodiment of the present invention, such as Figure 1 , Figure 2 as well as Figure 5 As shown, it also includes an output bus 7, which includes a body 701, a second mounting hole on the body 701, and an output electrode plate 702 extending from one end of the body 701 along the X direction. The output electrode plate 702 is fixed to the top surface of the housing 1 by a snap-fit ​​structure. The body 701 is fitted into the assembly groove 2021 through the second mounting hole and is interference-fitted with the corresponding terminal 202. It can be understood that the body 701 of the output bus 7 can form a stable connection with the corresponding terminal 202 through the second mounting hole, ensuring smooth current output. The design of the output electrode plate 702 extending along the X direction can make reasonable use of the internal space of the battery pack and avoid layout conflicts with other components inside the battery pack. The snap-fit ​​structure used to fix the output electrode plate 702 to the top surface of the housing 1 not only provides a firm connection and effectively resists the influence of external forces such as vibration and impact, ensuring the overall structural stability of the output bus 7, but also simplifies the assembly process and facilitates later maintenance and repair.

[0060] Specifically, in this embodiment, the number of battery cells 201 arranged side by side along the X direction is odd, and multiple battery cells 201 are connected in series through the inter-cell bus 4. At this time, there will be an unpaired terminal 202 remaining at the end of the battery cell module 2 in the X direction. The electrical energy inside the battery cell module 2 can be output to the outside through this terminal 202 and the output terminal bus 7.

[0061] Furthermore, in order to make reasonable use of the internal space of the battery pack, the output plate 702 can be extended along the Y direction, so that the output plate 702 and the main body 701 are arranged in an L-shape.

[0062] Furthermore, such as Figure 1 As shown, the height of the side wall of the housing 1 in the X direction is lower than the height of the top surface of the cell module 2. Therefore, the output bus 7 also includes a connecting plate connecting the output electrode plate 702 and the body 701. Specifically, the connecting plate extends in the Z direction, the output electrode plate 702 extends in the Y direction, and the body 701 extends in the X direction.

[0063] According to one embodiment of the present invention, such as Figure 1 , Figure 2 as well as Figure 5 As shown, the snap-fit ​​structure includes a slot 101 with barbs inside. The output electrode 702 is inserted into the slot 101 and abuts against the barbs. In this embodiment, inserting the output electrode 702 into the slot 101 prevents relative rotation between the output busbar 7 and the corresponding electrode post 202 under vibration, impact, or other conditions. The barbs inside the slot 101 increase the friction between the output electrode 702 and the slot 101, reducing the possibility of the output electrode 702 detaching from the slot 101.

[0064] It is understood that multiple slots 101 can be used to fix the output electrode 702. For example, along the Y direction, the top surface of the housing 1 has at least two slots 101 spaced apart, and the distance between adjacent slots 101 is less than 120 mm.

[0065] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: The housing has an opening and an inner cavity communicating with the opening; A battery cell module includes multiple battery cells arranged side-by-side in the inner cavity of the housing along the X direction. Each battery cell has a pair of terminals spaced apart on its top surface along the Y direction, and the terminals have an assembly groove on their radial outer periphery. The busbar bracket is provided with through holes corresponding to the terminals of all the battery cells. The busbar bracket passes through the through holes and covers the top surface of the battery cell module. A busbar between battery cells includes a busbar body and a pair of first mounting holes spaced apart on the busbar body. Along the Z direction, the thickness T of the busbar body matches the height H of the mounting groove. Along the X direction, the inter-cell busbar is fitted into the assembly groove of the adjacent terminal of the adjacent cell through a pair of first mounting holes and is connected to the terminal with an interference fit.

2. The battery pack according to claim 1, characterized in that, Along the Z direction, the outer edge of the top surface of the pole post is provided with a first rounded corner, and the bottom of the inner wall of the busbar body located in the first mounting hole is provided with a second rounded corner.

3. The battery pack according to claim 1, characterized in that, Along the Z-direction, the bottom surface of the busbar bracket is glued to the top surface of the battery cell module, and the inter-cell busbar is glued to the top surface of the busbar bracket.

4. The battery pack according to claim 3, characterized in that, Along the X direction, the busbar bracket has a downwardly bent groove between every two adjacent poles, and the bottom surface of the groove is glued to the top surface of the cell module.

5. The battery pack according to claim 4, characterized in that, It also includes a flexible printed circuit board, which is glued to the top surface of the busbar bracket and located between two opposing rows of the cell busbars.

6. The battery pack according to claim 5, characterized in that, Along the Y direction, the cell busbar has an upwardly bent protrusion at the portion between a pair of first mounting holes; It also includes voltage detection pieces that correspond one-to-one with the protrusions. One end of the voltage detection piece is fixed to the top surface of the protrusion, and the other end is electrically connected to the flexible printed circuit board. The flexible printed circuit board has meandering slots on opposite sides of the voltage detection piece.

7. The battery pack according to claim 6, characterized in that, The flexible printed circuit board includes two sub-circuit boards, and the end of the voltage detection piece that is electrically connected to the flexible printed circuit board is inserted and bonded between the two sub-circuit boards.

8. The battery pack according to claim 6, characterized in that, The protrusions are provided corresponding to the grooves.

9. The battery pack according to any one of claims 1 to 8, characterized in that, It also includes an output bus, which includes a body, a second mounting hole on the body, and an output electrode plate extending from one end of the body along the X direction. The output electrode plate is fixed to the top surface of the housing by a snap-fit ​​structure. The body is fitted into the assembly groove through the second mounting hole and is interference-fitted with the corresponding electrode post.

10. The battery pack according to claim 9, characterized in that, The buckle structure includes a slot, and a barbed structure is provided in the slot. The output electrode plate is inserted into the slot and abuts against the barbed structure.

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