Battery pack for low-speed vehicle

Abstract

This utility model discloses a low-speed automotive battery pack, belonging to the field of battery technology. The low-speed automotive battery pack includes a shell, a pouch battery pack, a tab fixing plate, and a PCB board assembly. The pouch battery pack is disposed within the shell and includes several pouch batteries stacked sequentially along a first direction. Each pouch battery has a positive tab and a negative tab extending from both ends along a second direction. The tab fixing plate has first through holes corresponding to the tabs on corresponding sides. The PCB board assembly includes a board body and several busbars. The board body is snapped onto the corresponding tab fixing plate, and the busbars are disposed on the side of the board body opposite to the pouch batteries. The board body also has second through holes corresponding to the first through holes. The positive and negative tabs pass through the corresponding first and second through holes sequentially and are connected through the corresponding busbars. The low-speed automotive battery pack enables accurate positioning of the tabs and busbars during welding, ensuring the welding effect between them.

Description

Technical Field

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

[0002] With the development of vehicle technology, electric vehicle technology has become more and more mature. As a result, various low-speed electric vehicles have appeared in our lives, such as sightseeing vehicles, patrol vehicles, golf carts and other low-speed transportation vehicles. To ensure safety, the batteries in low-speed vehicles are usually powered by lithium batteries.

[0003] Low-speed automotive battery packs in related technologies typically include a housing, a pouch cell battery pack, and a PCB assembly. The pouch cell battery pack is housed within the housing and comprises multiple pouch cells stacked sequentially. The positive electrode tab of each pouch cell overlaps with the negative electrode tab of its adjacent pouch cell to form a welded joint. Each welded joint is correspondingly welded to a busbar on the PCB assembly. However, during the welding of the welded joints to the corresponding busbars, inaccurate positioning and weak welds often occur, affecting the performance of the finished battery pack.

[0004] Therefore, there is an urgent need for a low-speed automotive battery pack to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a low-speed vehicle battery pack that can achieve accurate positioning during the welding of the tabs and busbars, ensuring the welding effect between the two and thus guaranteeing the performance of the finished battery pack.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A low-speed automotive battery pack, comprising:

[0008] The outer shell, which forms a receiving cavity inside;

[0009] A pouch battery pack is disposed in the receiving cavity and includes a plurality of pouch batteries stacked sequentially along a first direction. Each pouch battery has a positive electrode tab and a negative electrode tab extending from both ends along a second direction.

[0010] The two tab fixing plates are respectively located at both ends of the soft-pack battery pack along the second direction, and the tab fixing plates are provided with first through holes corresponding to the tabs on the corresponding sides.

[0011] The PCB assembly is configured one-to-one with the tab fixing plate. The PCB assembly includes a board body and a plurality of busbars. The board body is snapped onto the side of the corresponding tab fixing plate away from the soft-pack battery pack. The plurality of busbars are configured on the side of the board body away from the soft-pack battery pack. The board body is also provided with second through holes that correspond one-to-one with the first through holes. The positive tab and the negative tab pass through the corresponding first through holes and the second through holes in sequence and are connected through the corresponding busbars.

[0012] Wherein, the first direction and the second direction are perpendicular to each other.

[0013] As a preferred embodiment of the low-speed vehicle battery pack provided by this utility model, the positive tab of each soft-pack battery and the negative tab of the adjacent soft-pack battery form a tab group. The positive tab and the negative tab in the tab group pass through the corresponding first through hole and the second through hole in sequence, and are bent towards each other and welded to the corresponding busbar.

[0014] The two pouch batteries located at both ends of the first direction each have a positive terminal and a negative terminal, which are used to electrically connect to an external power source or an external electrical appliance.

[0015] As a preferred embodiment of the low-speed vehicle battery pack provided by this utility model, the PCB assembly further includes a connecting piece, and each of the electrode fixing plates is provided with the connecting piece, which is used to electrically connect the positive terminal or the negative terminal on the corresponding side.

[0016] As a preferred embodiment of the low-speed vehicle battery pack provided by this utility model, the low-speed vehicle battery pack further includes a battery management system, a signal acquisition device is provided on the board body, a control chip is provided on the battery management system, and the signal acquisition device and the control chip are signal connected.

[0017] As a preferred embodiment of the low-speed vehicle battery pack provided by this utility model, the low-speed vehicle battery pack further includes a heat-shrink film, which covers the soft-pack battery pack and the battery management system.

[0018] As a preferred embodiment of the low-speed vehicle battery pack provided by this utility model, the low-speed vehicle battery pack further includes:

[0019] The first buffer is provided between the battery management system and the soft-pack battery pack, and between the battery management system and the outer casing;

[0020] A second buffer is located between the two first buffers, and a plurality of second buffers are arranged around the battery management system.

[0021] As a preferred embodiment of the low-speed vehicle battery pack provided by this utility model, a plurality of buckles are arranged at intervals along the circumference of the tab fixing plate. Each buckle includes a connecting part and a hook part. One end of the connecting part is connected to the tab fixing plate, and the hook part is connected to the other end of the connecting part and extends toward the center of the tab fixing plate. The edge of the plate body is engaged with the inner side of the hook part.

[0022] As a preferred embodiment of the low-speed vehicle battery pack provided by this utility model, a guide surface is provided on the outer side of the hook portion, and the guide surface gradually tilts towards the electrode fixing plate in a direction away from the connecting portion.

[0023] As a preferred embodiment of the low-speed vehicle battery pack provided by this utility model, the low-speed vehicle battery pack further includes:

[0024] Fixed brackets, the two fixed brackets are respectively located at both ends of the soft-pack battery pack along the second direction;

[0025] A fixing strap is provided around the outside of the pouch battery pack and the two fixing brackets to fix the pouch battery pack and the two fixing brackets.

[0026] As a preferred embodiment of the low-speed vehicle battery pack provided by this utility model, the soft-pack battery pack further includes a heat insulation plate, which is disposed between adjacent soft-pack batteries.

[0027] And / or, an insulating plate is provided between the PCB assembly and the housing;

[0028] And / or, a third buffer is provided between the PCB assembly and the housing.

[0029] The beneficial effects of this utility model are as follows:

[0030] The low-speed vehicle battery pack provided by this utility model, by setting a tab fixing plate and setting corresponding first and second through holes on the tab fixing plate and the PCB board assembly respectively, can position the positive and negative tabs to ensure the accuracy of the position of the positive and negative tabs relative to the tab fixing plate. By snapping the PCB board assembly to the tab fixing plate, the accuracy of the position of the PCB board assembly relative to the tab fixing plate can be ensured. This allows the positive and negative tabs to have more precise positioning when soldering to the corresponding busbars, so as to ensure the soldering effect and thus ensure the performance of the finished battery pack. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the low-speed vehicle battery pack provided in this embodiment of the utility model;

[0033] Figure 2 This is a partial exploded structural diagram of the low-speed vehicle battery pack with the top cover removed, provided in this embodiment of the utility model.

[0034] Figure 3 This is one of the partial exploded structural diagrams of the low-speed vehicle battery pack with the outer shell hidden, provided in this embodiment of the utility model;

[0035] Figure 4 This is a schematic diagram of the structure of the soft-pack battery provided in this embodiment of the utility model;

[0036] Figure 5 This is one of the structural schematic diagrams of the PCB board assembly and the tab fixing plate provided in this embodiment of the utility model;

[0037] Figure 6 This is the second structural schematic diagram of the PCB board assembly and the tab fixing plate provided in this embodiment of the utility model;

[0038] Figure 7 yes Figure 2 A magnified view of a portion at point A;

[0039] Figure 8 This is the second partially exploded structural diagram of the low-speed vehicle battery pack with the outer shell hidden, provided in this embodiment of the utility model.

[0040] Figure label:

[0041] 10. Outer shell; 11. Bottom shell; 12. Top cover; 121. Charging socket; 122. Discharge socket; 123. Stainless steel nameplate; 124. Handle;

[0042] 20. Soft-pack battery pack; 21. Soft-pack battery; 211. Positive tab; 212. Negative tab; 22. Positive terminal; 23. Negative terminal; 24. Heat insulation plate;

[0043] 30. Electrode fixing plate; 31. First through hole; 32. Buckle; 321. Connecting part; 322. Hook part; 3221. Guide surface;

[0044] 40. PCB board assembly; 41. Board body; 410. Second through hole; 42. Busbar; 43. Connecting piece;

[0045] 50. Battery Management System;

[0046] 61. Fixing bracket; 62. Fixing strap;

[0047] 71. First buffer component; 72. Second buffer component; 73. Third buffer component;

[0048] 80. Insulating board;

[0049] 90. Heat shrink film. Detailed Implementation

[0050] Before explaining any embodiment of the present invention in detail, it should be understood that the present invention is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0051] In this invention, the terms "comprising," "including," "having," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0052] In this invention, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "and / or" relationship.

[0053] In this invention, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0054] In this invention, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the value and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0055] In this invention, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can be performed by one part, one component, or a combination of multiple parts.

[0056] In this utility model, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this utility model. Furthermore, in the context, it should be understood that when one element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent the direct orientation but can also be understood as the lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0057] like Figures 1-3 As shown, this embodiment provides a low-speed automotive battery pack, which includes a housing 10, a pouch battery pack 20, a tab fixing plate 30, and a PCB board assembly 40. The housing 10 has a receiving cavity, within which the pouch battery pack 20, the tab fixing plate 30, and the PCB board assembly 40 are all disposed. Specifically, the housing 10 includes a bottom shell 11 and a top cover 12, which are interlocked to form the aforementioned receiving cavity. Optionally, the bottom shell 11 and the top cover 12 can be fixed together by snap-fitting, welding, fastener connection, or other methods.

[0058] like Figure 1As shown, a stainless steel nameplate 123 is affixed to the top cover 12 to indicate basic information such as the model, size, weight, operating voltage, charging voltage, discharge cut-off voltage, manufacturer's name, production date or batch number, and safety markings of the low-speed vehicle battery pack. Optionally, the stainless steel nameplate 123 is fixed to the top cover 12 by connecting screws, ensuring a secure connection and facilitating easy installation and removal.

[0059] In some embodiments, the top cover 12 is further provided with a handle 124 to facilitate the disassembly, assembly, and transfer of the battery pack by an operator. In this example, the handle 124 is located in the middle of the top cover 12 to provide a stable and uniform pulling force to the battery pack. Optionally, the handle 124 can be a damped spring-loaded rigid handle, capable of applying a uniform force of 80 kg within 10 seconds and maintaining its position for 1 minute. Optionally, the handle 124 is connected to the top cover 12 by a combination of bolts, spring washers, and flat washers.

[0060] Optionally, the handle 124 has a U-shaped structure and is rotatably connected to the upper cover 12. When the handle 124 is not needed, it can be rotated to a position close to the upper cover 12 to reduce storage space.

[0061] like Figures 3-4 As shown, the pouch battery pack 20 includes multiple pouch batteries 21, which are horizontally stacked along a first direction. Each pouch battery 21 has a positive electrode tab 211 and a negative electrode tab 212 extending from both ends along a second direction. The first direction is the thickness direction of the pouch battery 21, and the second direction is the height direction of the pouch battery 21; that is, the first direction and the second direction are perpendicular to each other.

[0062] In this embodiment, the polarities of the tabs on the same side of two adjacent pouch cells 21 are opposite. Therefore, the positive tab 211 of any one of the two adjacent pouch cells 21 is adjacent to the negative tab 212 of the other adjacent pouch cell 21. The positive tab 211 of the pouch cell 21 is connected to the negative tab 212 of the adjacent pouch cell 21 through the busbar 42, thereby connecting multiple pouch cells 21 in series. It should be noted that the series-connected pouch cell battery pack 20 has a total positive output terminal and a total negative output terminal. The total positive output terminal is defined as terminal positive 22, and the total negative output terminal is defined as terminal negative 23. Terminal positive 22 and terminal negative 23 are used to electrically connect to an external power source or an external electrical appliance to charge the low-speed vehicle battery pack through the external power source or to supply power to an external electrical appliance through the low-speed vehicle battery pack.

[0063] Optionally, the pouch battery pack 20 further includes a heat insulation plate 24, which is disposed between adjacent pouch batteries 21. The heat insulation plate 24 can block heat transfer between adjacent pouch batteries 21, thereby allowing the generated heat to dissipate outward through the casing 10, preventing uncontrollable thermal runaway between the pouch batteries 21. In this embodiment, a heat insulation plate 24 is disposed between every two adjacent pouch batteries 21. In other embodiments, the heat insulation plate 24 may be disposed only between some adjacent pouch batteries 21. Optionally, the heat insulation plate 24 may be made of pre-oxidized fiber or other types of aerogel composite materials, and is not specifically limited here.

[0064] like Figures 3-6 As shown, two tab fixing plates 30 are respectively located at both ends of the soft-pack battery pack 20 along the second direction, and the tab fixing plates 30 are provided with first through holes 31 corresponding to the tabs on the corresponding sides; the PCB board assembly 40 is provided in a corresponding manner to the tab fixing plates 30. The PCB board assembly 40 includes a board body 41 and a plurality of busbars 42. The board body 41 is snapped onto the side of the corresponding tab fixing plate 30 away from the soft-pack battery pack 20. The plurality of busbars 42 are provided on the side of the board body 41 away from the soft-pack battery 21. The board body 41 is also provided with second through holes 410 corresponding to the first through holes 31. The positive tab 211 and the negative tab 212 pass through the corresponding first through holes 31 and second through holes 410 in sequence and are connected through the corresponding busbars 42.

[0065] The low-speed vehicle battery pack provided in this embodiment, by setting a tab fixing plate 30 and setting corresponding first through holes 31 and second through holes 410 on the tab fixing plate 30 and the board body 41 of the PCB board assembly 40, can position the positive tab 211 and the negative tab 212 to ensure the accuracy of the position of the positive tab 211 and the negative tab 212 relative to the tab fixing plate 30. By snapping the PCB board assembly 40 to the tab fixing plate 30, the accuracy of the position of the PCB board assembly 40 relative to the tab fixing plate 30 can be ensured. This allows the positive tab 211 and the negative tab 212 to have more precise positioning when welding with the corresponding busbar 42, so as to ensure the welding effect and thus ensure the performance of the finished battery pack.

[0066] Optionally, the positive tab 211 of each pouch cell 21 and the negative tab 212 of its adjacent pouch cell 21 form a tab group. The positive tab 211 and negative tab 212 in the tab group pass sequentially through the corresponding first through-hole 31 and second through-hole 410, are bent towards each other, and welded to the corresponding busbar 42. This design increases the contact area between the positive tab 211, negative tab 212, and the corresponding busbar 42, improving the stability of the welding between the three and thus ensuring the overall performance of the battery pack.

[0067] like Figure 4, Figure 6 and Figure 7 As shown, the PCB assembly 40 also includes connecting pieces 43. Each tab fixing plate 30 is provided with a connecting piece 43, which is used to electrically connect the corresponding positive terminal 22 or negative terminal 23. Further, the housing 10 (specifically the upper cover 12) is provided with a charging socket 121 and a discharging socket 122. After the positive terminal 22 and the negative terminal 23 are connected to the corresponding connecting pieces 43, they are electrically connected to the charging socket 121 and the discharging socket 122 through corresponding wiring harnesses to ensure the stability and reliability of the electrical connection. When the charging socket 121 is electrically connected to an external power source, the external power source can charge the low-speed vehicle battery pack. When the discharging socket 122 is electrically connected to an external electrical appliance, the low-speed vehicle battery pack can supply power to the external electrical appliance. Optionally, the charging socket 121 and the discharging socket 122 are respectively fixed to the upper cover 12 with connecting screws for easy disassembly and secure connection.

[0068] like Figures 5-7 As shown, multiple clips 32 are spaced apart circumferentially along the tab fixing plate 30. Each clip 32 includes a connecting part 321 and a hook part 322. One end of the connecting part 321 is connected to the tab fixing plate 30, and the hook part 322 is connected to the other end of the connecting part 321 and extends towards the center of the tab fixing plate 30. The edge of the plate body 41 is engaged with the inner side of the hook part 322. The connecting part 321 and the hook part 322 are connected to form a roughly L-shaped clip 32, which has a simple structure and can achieve stable fixation of the PCB board assembly 40.

[0069] Optionally, a guide surface 3221 is provided on the outer side of the hook portion 322. The guide surface 3221 gradually tilts towards the tab fixing plate 30 in a direction away from the connecting portion 321, so that when the PCB board assembly 40 and the tab fixing plate 30 are assembled, the PCB board assembly 40 can slide into the inner side of the hook portion 322 along the tilted guide surface 3221 to complete the snap-fit, thereby improving the assembly efficiency between the two.

[0070] like Figure 3 and Figure 8As shown, the low-speed vehicle battery pack also includes a Battery Management System (BMS) 50. A signal acquisition unit is mounted on the board body 41, and a control chip is mounted on the battery management system 50. The signal acquisition unit and the control chip are connected by signals. Specifically, the board body 41 also has a signal circuit connecting the pouch battery 21 and the signal acquisition unit, so that the signal acquisition unit can acquire corresponding information from the pouch battery 21. The information acquired by the signal acquisition unit from the pouch battery 21 can be transmitted to the BMS. The BMS can transmit the information from the pouch battery 21 to the control system of the low-speed vehicle in real time, so as to promptly remind the user of the current status of the pouch battery pack 20, thereby ensuring the safety of using the low-speed vehicle battery pack.

[0071] Optionally, the signal acquisition device can be a temperature acquisition device and / or a voltage acquisition device and / or a current acquisition device.

[0072] like Figure 2 and Figure 8 As shown, in this embodiment, the two PCB assemblies 40 are located at both ends of the pouch battery pack 20 along the second direction, and the BMS is located at one end of the pouch battery pack 20 along the third direction, so as to make full use of the accommodating space in the housing 10 and improve the structural compactness of the entire battery pack. The third direction refers to the width direction of the pouch battery 21, that is, the first direction, the second direction, and the third direction are all perpendicular to each other.

[0073] Optionally, the low-speed vehicle battery pack further includes a first buffer 71 and a second buffer 72. The two first buffers 71 are spaced apart along a third direction, and the BMS is located between the two first buffers 71. A plurality of second buffers 72 are located between the two first buffers 71 and are arranged around the BMS. By setting the first buffers 71 and the second buffers 72, a buffer space can be formed to surround the BMS, thereby securing the BMS and its corresponding wiring harness, while preventing damage to the BMS when the housing 10 is subjected to impact. In this embodiment, both the first buffer 71 and the second buffer 72 can be made of foam, which provides good cushioning effect and is relatively inexpensive.

[0074] like Figure 2 , Figure 3 and Figure 8As shown, to ensure the fixation of the pouch battery pack 20, the low-speed vehicle battery pack also includes fixing brackets 61 and fixing straps 62. The two fixing brackets 61 are located at both ends of the pouch battery pack 20 along the second direction. The fixing straps 62 are looped around the pouch battery pack 20 and the two fixing brackets 61 to fix them. By setting the fixing brackets 61 and fixing straps 62, the stability of the pouch battery pack 20 can be ensured, preventing relative displacement of the individual pouch batteries 21 during use and thus avoiding impact on the battery pack's performance. Optionally, at least two fixing straps 62 are provided, spaced apart along the second direction, to further improve their fixing effect on the pouch battery pack 20.

[0075] Optionally, the low-speed vehicle battery pack further includes a third buffer 73, which is disposed between the PCB assembly 40 and the outer casing 10. This third buffer 73 serves to dampen shocks and prevent rigid impacts between the outer casing 10 and the pouch battery pack 20 and the PCB assembly 40, thereby preventing damage to the pouch battery pack 20 and the PCB assembly 40. In this embodiment, the third buffer 73 is an epoxy board. Specifically, the third buffer 73 is disposed between the PCB assembly 40 and the inner bottom wall of the bottom shell 11, and between the PCB assembly 40 and the inner top wall of the top cover 12.

[0076] Optionally, the low-speed vehicle battery pack also includes an insulating plate 80, which is disposed between the PCB assembly 40 and the outer casing 10. The insulating plate 80 provides insulation between the PCB assembly 40 and the outer casing 10, thereby ensuring the safety of the entire battery pack. Specifically, insulating plates 80 are disposed between the PCB assembly 40 and the inner bottom wall of the bottom shell 11, and between the PCB assembly 40 and the inner top wall of the top cover 12.

[0077] Continue as Figure 2 As shown, the low-speed vehicle battery pack also includes a heat-shrink film 90, which covers the pouch battery pack 20 and the BMS, thereby securing the pouch battery pack 20 and the BMS, reducing the weight of the battery pack, and facilitating the disassembly and assembly of the pouch battery pack 20 and the outer casing 10 during later maintenance. The heat-shrink film 90 is made of polyvinyl chloride (PVC).

[0078] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments do not limit this utility model in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A battery pack for low-speed vehicles, characterized by comprising: include: The outer shell (10) has a receiving cavity inside; A pouch battery pack (20) is disposed in the receiving cavity and includes a plurality of pouch batteries (21) stacked sequentially along a first direction. Each pouch battery (21) has a positive electrode tab (211) and a negative electrode tab (212) extending from both ends along a second direction. The two tab fixing plates (30) are respectively located at both ends of the soft pack battery pack (20) along the second direction, and the tab fixing plates (30) are provided with first through holes (31) corresponding to the tabs on the corresponding sides. The PCB assembly (40) is configured one-to-one with the tab fixing plate (30). The PCB assembly (40) includes a board body (41) and a plurality of busbars (42). The board body (41) is snapped onto the side of the corresponding tab fixing plate (30) away from the soft-pack battery pack (20). The plurality of busbars (42) are configured on the side of the board body (41) away from the soft-pack battery (21). The board body (41) is also provided with a second through hole (410) that corresponds one-to-one with the first through hole (31). The positive tab (211) and the negative tab (212) pass through the corresponding first through hole (31) and the second through hole (410) in sequence and are connected through the corresponding busbars (42). Wherein, the first direction and the second direction are perpendicular to each other.

2. The low-speed vehicle battery pack according to claim 1, characterized in that, The positive tab (211) of each of the pouch cells (21) and the negative tab (212) of the adjacent pouch cells (21) form a tab group. The positive tab (211) and the negative tab (212) in the tab group pass through the corresponding first perforation (31) and the second perforation (410) in sequence, and are bent toward each other and welded to the corresponding busbar (42). The two pouch cells (21) located at both ends of the first direction have a positive terminal (22) and a negative terminal (23), respectively, and the positive terminal (22) and the negative terminal (23) are used to electrically connect to an external power source or an external appliance.

3. The low-speed vehicle battery pack according to claim 2, characterized in that, The PCB assembly (40) also includes a connecting piece (43), and each of the tab fixing plates (30) is provided with the connecting piece (43). The connecting piece (43) is used to electrically connect the positive terminal (22) or the negative terminal (23) on the corresponding side.

4. The low-speed vehicle battery pack according to claim 1, characterized in that, The low-speed vehicle battery pack also includes a battery management system (50), a signal acquisition device is provided on the board body (41), and a control chip is provided on the battery management system (50). The signal acquisition device and the control chip are connected by signals.

5. The low-speed vehicle battery pack according to claim 4, characterized in that, The low-speed vehicle battery pack also includes a heat-shrink film (90) that covers the pouch battery pack (20) and the battery management system (50).

6. The low-speed vehicle battery pack according to claim 4, characterized in that, The low-speed vehicle battery pack also includes: The first buffer (71) is provided between the battery management system (50) and the soft-pack battery pack (20) and between the battery management system (50) and the outer casing (10); The second buffer (72) is located between the two first buffers (71), and a plurality of the second buffers (72) are arranged around the battery management system (50).

7. The low-speed vehicle battery pack according to claim 1, characterized in that, Multiple buckles (32) are provided at intervals along the circumference of the tab fixing plate (30). Each buckle (32) includes a connecting part (321) and a hook part (322). One end of the connecting part (321) is connected to the tab fixing plate (30), and the hook part (322) is connected to the other end of the connecting part (321) and extends toward the center of the tab fixing plate (30). The edge of the plate body (41) is engaged with the inner side of the hook part (322).

8. The low-speed vehicle battery pack according to claim 7, characterized in that, The outer side of the hook portion (322) is provided with a guide surface (3221), which gradually tilts towards the pole tab fixing plate (30) in a direction away from the connecting portion (321).

9. The low-speed vehicle battery pack according to any one of claims 1 to 8, characterized in that, The low-speed vehicle battery pack also includes: Fixed brackets (61), the two fixed brackets (61) are respectively located at both ends of the soft-pack battery pack (20) along the second direction; A fixing strap (62) is arranged around the soft-pack battery pack (20) and the two fixing brackets (61) to fix the soft-pack battery pack (20) and the two fixing brackets (61).

10. The low-speed vehicle battery pack according to any one of claims 1 to 8, characterized in that, The pouch battery pack (20) also includes a heat insulation plate (24), which is disposed between adjacent pouch batteries (21); And / or, an insulating plate (80) is provided between the PCB assembly (40) and the housing (10); And / or, a third buffer (73) is provided between the PCB assembly (40) and the housing (10).

Images