Battery pack and electric device

Abstract

This utility model discloses a battery pack and electrical equipment, including: a housing, and a battery module, a battery management system (BMS), a shunt, an electrical connector, and a first data acquisition plate located inside the housing; one end of the shunt is electrically connected to the battery module, and the other end is connected to an external load; the electrical connector includes an independently arranged first signal acquisition line and a power output line, one end of the electrical connector is electrically connected to the battery management system, and the other end extends to one side of the shunt; the first data acquisition plate includes a first connecting part, a second connecting part, and a third connecting part, the first connecting part and the second connecting part are spaced apart and electrically connected to the third connecting part respectively, the first connecting part is electrically connected to the first signal acquisition line, the second connecting part is electrically connected to the power output line, and the third connecting part is electrically connected to the shunt. Placing the shunt outside the BMS allows for flexible adjustment of the positions of both the shunt and the BMS; it facilitates optimization of the overall battery pack structure; and it ensures the accuracy of the shunt current acquisition.

Description

Technical Field

[0001] This utility model relates to the field of battery structure technology, and more specifically, to a battery pack. Furthermore, this utility model also relates to an electrical device comprising the aforementioned battery pack. Background Technology

[0002] Battery packs are widely used in various electrical devices. For example, with the development of new energy vehicles, battery packs, as the power batteries of new energy vehicles, are widely used in new energy vehicles.

[0003] The battery pack comes with a built-in Battery Management System (BMS), which automatically disconnects the battery pack from the outside when the battery pack experiences over-temperature, over-voltage, over-current, or under-voltage conditions, thereby ensuring the safety of the battery pack and improving the safety level of the electrical equipment.

[0004] Battery Management Systems (BMS) often use shunts to collect the charging and discharging current of the battery pack. However, in related technologies, the shunts are all built into the BMS board, and the overall size of the BMS is relatively large, occupying a lot of space. At the same time, in order to accommodate the connection between the shunt and the charging and discharging circuit of the battery pack, the BMS usually needs to be placed in a specific location on the battery pack, such as placing the BMS on top of the battery modules. This results in a large overall size of the battery pack in a specific direction (such as along the height of the battery pack), making it impossible for the battery pack to meet the installation requirements under space-constrained conditions in that specific direction.

[0005] Therefore, how to make the battery pack meet the installation requirements of space-constrained environments is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a battery pack that can meet the installation requirements of space-constrained applications.

[0007] Another objective of this invention is to provide an electrical device that includes the aforementioned battery pack, which enables the battery pack to be installed even in situations where space is limited.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A battery pack, comprising:

[0010] The housing, and the battery module, battery management system, shunt, electrical connectors and first data acquisition chip located inside the housing;

[0011] One end of the shunt is electrically connected to the battery module, and the other end is connected to an external load;

[0012] The electrical connector includes a first signal acquisition line and a power output line arranged independently. One end of the electrical connector is electrically connected to the battery management system, and the other end extends to one side of the shunt.

[0013] The first acquisition chip includes a first connection part, a second connection part, and a third connection part. The first connection part and the second connection part are spaced apart and electrically connected to the third connection part. The first connection part is electrically connected to the first signal acquisition line, the second connection part is electrically connected to the power output line, and the third connection part is electrically connected to the shunt.

[0014] Optionally, the shunt includes a first adapter piece, a resistor piece, and a second adapter piece connected in sequence. The first adapter piece is connected to the negative terminal of the battery module, the second adapter piece is connected to the negative terminal of an external load, and the third connection part is electrically connected to the first adapter piece.

[0015] The battery pack also includes a second acquisition chip, and the electrical connector also includes a second signal acquisition line. The two ends of the second acquisition chip are electrically connected to the second signal acquisition line and the second adapter chip, respectively.

[0016] Optionally, the width of the first connecting portion is smaller than the width of the second connecting portion; and / or,

[0017] The width of the first connecting part ranges from 1mm to 3mm, and the width of the second connecting part ranges from 1mm to 10mm;

[0018] Preferably, the width of the first connecting part is in the range of 1.5mm-2.5mm, and the width of the second connecting part is in the range of 3mm-7mm.

[0019] Optionally, a first U-shaped groove is formed between the first connecting portion and the second connecting portion;

[0020] The width of the first U-shaped groove ranges from 1mm to 25mm;

[0021] Preferably, the width of the first U-shaped groove is in the range of 3mm-15mm.

[0022] The width of the first U-shaped groove ranges from 5mm to 10mm.

[0023] Optionally, the first connecting portion is provided with a first buffer portion; and / or,

[0024] The second connecting portion is provided with a second buffer portion; and / or,

[0025] The third connecting part is provided with a third buffer part.

[0026] Optionally, the first connecting portion, the second connecting portion, and the third connecting portion are arranged in a Y-shape.

[0027] Optionally, the first acquisition chip has independently arranged first solder marks and second solder marks.

[0028] One end of the first solder mark is electrically connected to the first signal acquisition line via the first connecting part, and the other end is electrically connected to the shunt via the third connecting part;

[0029] One end of the second solder mark is electrically connected to the power output line via the second connection part, and the other end is electrically connected to the shunt via the third connection part.

[0030] Optionally, a first conductive adhesive is provided between the first connecting portion and the electrical connector; and / or,

[0031] A second conductive adhesive is provided between the second connecting portion and the electrical connector; and / or,

[0032] A third conductive adhesive is provided between the third connecting part and the electrical connector.

[0033] Optionally, the electrical connector is a flexible connector, the battery module has a boss, the flexible connector is arranged along the surface of the boss, and the surface of the boss that contacts the flexible connector is provided with a buffer.

[0034] An electrical device comprising any of the above-mentioned battery packs.

[0035] The battery pack provided by this utility model has the following beneficial effects:

[0036] The battery management system (BMS) is connected to the battery modules. The shunt is located outside the BMS, connecting to the battery modules and the BMS via electrical connectors. In other words, the shunt is external to the BMS, making it independent and not occupying internal space. Separating the shunt from the BMS allows for flexible adjustment of both the shunt and BMS positions. This allows the shunt to be placed in a suitable location based on the structural characteristics of the battery pack's charging and discharging circuits, facilitating series connection between the shunt and the battery pack's charging and discharging circuits. Furthermore, the BMS can be placed in any desired location, optimizing the overall structural dimensions of the battery pack and enabling installation in space-constrained conditions. For example, the BMS can be placed on the side of the battery module to avoid the BMS occupying the height space of the battery module, making the battery pack adaptable to installation conditions with limited height space; at the same time, the shunt can be placed on the top of the battery module to facilitate the connection between the shunt and the battery module tabs, avoiding the complexity of the battery module tab structure caused by the BMS being located on the side of the battery module when the shunt is built into the BMS.

[0037] Furthermore, since the first acquisition chip is electrically connected to the first signal acquisition line of the electrical connector via the first connection part and to the power output line of the electrical connector via the second connection part, and the first and second connection parts are spaced apart, while the third connection part is electrically connected to the shunt and the electrical connector is electrically connected to the BMS, it is equivalent to forming two electrical connection paths between the shunt and the BMS through the first acquisition chip and the electrical connector. One electrical connection path (e.g., formed by the shunt, the third connection part, the first connection part, the first signal acquisition line, and the BMS) is used to acquire the voltage at one end of the shunt, and the other electrical connection path... (For example, formed by a shunt, a third connection, a second connection, a power output line, and a BMS) is used to power the BMS; that is, the battery pack separates the power signal point of the BMS from the voltage acquisition point, so that the power signal point of the BMS and the voltage acquisition point do not share the same connection. In this way, the power supply current and functional circuit current of the BMS return through the first connection without generating a voltage drop at the second connection. This ensures the accuracy of the shunt terminal voltage acquired by the second connection, which helps to solve the zero-point drift problem of the current acquired by the BMS using the shunt and improves the accuracy of the current acquired by the BMS.

[0038] The electrical equipment provided by this utility model includes the above-mentioned battery pack and has at least the beneficial effects of the above-mentioned battery pack. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0040] Figure 1 A schematic diagram of the external structure of the battery pack provided in a specific embodiment of this utility model;

[0041] Figure 2 This is an exploded view of the battery pack.

[0042] Figure 3 This is a schematic diagram of a partial internal structure of the battery pack;

[0043] Figure 4 This is a schematic diagram showing the electrical connection between the first data acquisition chip and the electrical connector;

[0044] Figure 5 This is a schematic diagram of the structure of the first acquisition chip;

[0045] Figure 6 This is a schematic diagram of the structure of a data acquisition chip in related technologies;

[0046] Figure 7 This is a schematic diagram showing that the first data acquisition chip is located at the end of the shunt near the negative terminal B- of the battery cell in the battery module, and the second data acquisition chip is located at the end of the shunt near the external negative terminal P- of the battery pack.

[0047] Figure 8 This is a connection diagram when the second acquisition chip and the first acquisition chip have the same structure.

[0048] Figure 9 This is a schematic diagram showing that the first data acquisition chip is located at the end of the shunt near the external negative terminal P- of the battery pack, and the second data acquisition chip is located at the end of the shunt near the cell negative terminal B- of the battery module.

[0049] Figure label:

[0050] 1-Battery module; 11-Positioning post; 12-Module frame; 2-Battery management system; 3-Shunter; 31-First adapter piece; 311-Fixing hole; 312-Fastener; 32-Resistor piece; 33-Second adapter piece; 4-Electrical connector; 41-First signal acquisition line; 42-Power output line; 43-Second signal acquisition line; 44-Spare function connection line; 51-First acquisition piece; 511-First connecting part; 512-Second connecting part; 513-Third connecting part; 514-First U-shaped groove; 52-Second acquisition piece; 521-Fourth connecting part; 522-Fifth connecting part; 523-Sixth connecting part; 524-Second U-shaped groove; 53-Acquisition piece in related technologies; 6-Boss; 7-Housing shell; 71-Lower housing; 72-Upper housing assembly. Detailed Implementation

[0051] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0052] The core of this invention is to provide a battery pack that can meet the installation requirements of space-constrained environments. Another core aspect of this invention is to provide an electrical device including the aforementioned battery pack, which can enable the battery pack to be installed even in space-constrained conditions.

[0053] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 This utility model provides a battery pack, including a housing 7, and a battery module 1, a battery management system 2, a shunt 3, an electrical connector 4, and a first acquisition plate 51 located inside the housing 7; one end of the shunt 3 is electrically connected to the battery module 1, and the other end is connected to an external load; the electrical connector 4 includes an independently arranged first signal acquisition line 41 and a power output line 42, one end of the electrical connector 4 is electrically connected to the battery management system 2, and the other end extends to one side of the shunt 3; the first acquisition plate 51 includes a first connecting part 511, a second connecting part 512, and a third connecting part 513, the first connecting part 511 and the second connecting part 512 are spaced apart and electrically connected to the third connecting part 513 respectively, the first connecting part 511 is electrically connected to the first signal acquisition line 41, the second connecting part 512 is electrically connected to the power output line 42, and the third connecting part 513 is electrically connected to the shunt 3.

[0054] It is understood that the battery management system 2 is connected to the battery module 1. In this embodiment, the shunt 3 is located outside the battery management system 2, connecting the shunt 3 to the battery module 1. The shunt 3 is connected to the battery management system 2 through the first acquisition chip 51 and the electrical connector 4. In other words, in this embodiment, the shunt 3 is placed outside the BMS, making the shunt 3 independent of the BMS and not occupying the internal space of the BMS. After separating the shunt 3 from the BMS, the positions of both the shunt 3 and the BMS can be flexibly adjusted. Therefore, the shunt 3 can be placed in a suitable position according to the relevant structural characteristics of the battery pack's charging and discharging circuit, facilitating the series connection of the shunt 3 and the charging and discharging circuit of the battery pack. In addition, the BMS can be placed in any desired position, which is beneficial to optimizing the overall structural dimensions of the battery pack, allowing the battery pack to adapt to the installation space and enabling the installation of the battery pack under space constraints. For example, the BMS can be placed on the side of the battery module 1 to avoid the BMS occupying the height space of the battery module 1, so that the battery pack can be adapted to installation conditions with limited height space; at the same time, the shunt 3 can be placed on the top of the battery module 1 to facilitate the connection between the shunt 3 and the battery module 1 tabs, so as to avoid the complexity of the battery module 1 tab structure caused by the BMS being placed on the side of the battery module 1 when the shunt 3 is built into the BMS.

[0055] Additionally, please combine Figure 4 and Figure 5 Since the first acquisition chip 51 is electrically connected to the first signal acquisition line 41 of the electrical connector 4 through the first connection part 511, and electrically connected to the power output line 42 of the electrical connector 4 through the second connection part 512; and the first connection part 511 and the second connection part 512 are spaced apart, while the third connection part 513 is electrically connected to the shunt 3 and the electrical connector 4 is electrically connected to the BMS, it is equivalent to forming two electrical connection paths between the shunt 3 and the BMS through the first acquisition chip 51 and the electrical connector 4. One electrical connection path (for example, formed by the shunt 3, the third connection part 513, the first connection part 511, the first signal acquisition line 41 and the BMS) is used to acquire the voltage at one end of the shunt 3. Another electrical connection path (e.g., formed by shunt 3, third connection 513, second connection 512, power output line 42, and BMS) is used to power the BMS; that is, in this embodiment, the power signal point of the BMS is separated from the voltage acquisition point, so that the power signal point of the BMS and the voltage acquisition point do not share the same connection. In this way, the power supply current and functional circuit current of the BMS return through the first connection 511, and no voltage drop is generated on the second connection 512. This ensures the accuracy of the voltage at the shunt 3 terminal acquired by the second connection 512, which helps to solve the problem of zero-point drift of the current acquired by the BMS using the shunt 3, and improves the accuracy of the current acquired by the BMS.

[0056] And in related technologies, such as Figure 6 As shown, since the power supply for the BMS's operation and the power supply for its functional circuits both come from the cells of battery module 1, in order to facilitate the power supply to the BMS and other functional circuits, the power supply signal of the BMS and / or the power supply signal of other functional circuits share the same connection part with the voltage acquisition signal (that is, the acquisition chip 53 in the related technology is an integral structure that is conductive everywhere, and a single acquisition chip is a connection part of the whole). In this case, since the shunt 3 itself and the line have parasitic impedance R, when the working current of the BMS flows through the parasitic impedance R of the acquisition chip 53 in the related technology, a weak voltage difference will be generated on R. When this weak voltage difference is acquired by the voltage acquisition point, it will be mistakenly regarded as part of the charging and discharging voltage of the battery pack, which will lead to inaccurate calculation of the charging and discharging current of the battery pack, resulting in the current zero point of the battery pack not being zero, causing the current zero point acquired by the BMS to drift, and thus affecting the current acquisition accuracy.

[0057] Therefore, this utility model embodiment solves the problem of current zero-point drift in BMS acquisition by dividing the first acquisition piece 51 into a first connection part 511, a second connection part 512 and a third connection part 513, thereby separating the first connection part 511 and the second connection part 512, and configuring the electrical connector 4 with independently arranged first signal acquisition line 41 and power output line 42.

[0058] like Figure 1 and Figure 2 As shown, the housing 7 includes a lower housing 71 and an upper housing assembly 72. The battery pack also includes a module frame 12 for mounting the battery module 1.

[0059] In addition, it should be noted that this embodiment does not limit the specific structure of the shunt 3. The structure of the shunt 3 can be adapted and customized according to the specific structure of the battery module 1. As long as the shunt 3 is made of metal alloy and has a specific resistance value, it can be installed on the battery module 1.

[0060] In addition, this embodiment does not limit the specific location of the shunt 3 in the battery pack charging and discharging circuit, as long as the shunt 3 can be connected in series in the battery pack charging and discharging circuit.

[0061] In some embodiments, the shunt 3 is connected in series between the external negative terminal P- of the battery pack and the cell negative terminal B- of the battery module 1; or, the shunt 3 is connected in series between the external positive terminal P+ of the battery pack and the cell positive terminal B+ of the battery module 1.

[0062] It is understandable that P- (Pack Negative) refers to the total negative terminal output by the battery pack, that is, the negative interface connecting the battery pack to the electrical system of the electrical equipment (such as an external load); B- (Battery Negative) refers to the direct negative terminal of battery module 1 inside the battery pack, that is, the negative terminal junction point of battery module 1; P+ (Pack Positive) refers to the total positive terminal output by the battery pack; B+ (Battery Positive) refers to the positive terminal junction point of battery module 1 inside the battery pack, wherein battery module 1 includes at least one cell connected in series.

[0063] When the shunt 3 is connected in series between the external negative terminal P- of the battery pack and the negative terminal B- of the battery cell in battery module 1, the current flow direction during battery pack discharge is: current from the positive terminal B+ of the cell → BMS board → positive terminal P+ of the battery pack → external load → negative terminal P- of the battery pack → shunt 3 → negative terminal B- of the cell; the current flow direction during battery pack charging is opposite to the current flow direction during battery pack discharging. It can be seen that the shunt 3, located between P- and B-, can accurately measure the current flowing through the entire battery pack, that is, the total charging and discharging current of the battery pack. Therefore, the BMS is connected to the shunt 3 through the electrical connector 4. The BMS can calculate the current value and manage the battery pack status by monitoring the voltage across the shunt 3.

[0064] Similarly, when the shunt 3 is connected in series between the external positive terminal P+ of the battery pack and the positive terminal B+ of the battery cell in battery module 1, the current flow direction during battery pack discharge is: current from the positive terminal B+ of the cell → BMS board → shunt 3 → battery pack P+ → external load → battery pack negative terminal P- → cell negative terminal B-; the current flow direction during battery pack charging is opposite to the current flow direction during battery pack discharge. It can be seen that when the shunt 3 is placed between P+ and B+, the current flowing through the entire battery pack can still be accurately measured. Therefore, the BMS can calculate the current value and manage the battery pack status by monitoring the voltage across the shunt 3.

[0065] For ease of description and understanding, the following description uses the scheme of connecting the shunt 3 in series between the external negative terminal P- of the battery pack and the negative terminal B- of the battery cell of the battery module 1.

[0066] For a battery pack with a charging circuit of: P+ → BMS-controlled main MOS switch → B+ → cell → B- → P-, and a discharging circuit of: B+ → BMS-controlled main MOS switch → P+ → (external load) → P- → B-, the static electricity generated during this transportation condition can reach up to 20kV, which can cause electrostatic interference (15kV) to trigger a false alarm. The BMS internal protection mechanism will then disconnect the main MOS switch.

[0067] To address the technical issue of the BMS internal protection mechanism disconnecting the main MOSFET switch due to accidental contact caused by electrostatic discharge (15KV), please refer to [reference needed]. Figure 3 and Figure 7 In some embodiments, the shunt 3 includes a first adapter plate 31, a resistor plate 32, and a second adapter plate 33 connected in sequence. The first adapter plate 31 is connected to the negative terminal B- of the battery module 1, and the second adapter plate 33 is connected to the negative terminal P- of the external load. The third connection part 513 is electrically connected to the first adapter plate 31. The battery pack also includes a second acquisition plate 52, and the electrical connector 4 also includes a second signal acquisition line 43. The two ends of the second acquisition plate 52 are electrically connected to the second signal acquisition line 43 and the second adapter plate 33, respectively.

[0068] In other words, this embodiment adopts a combination of a first acquisition chip 51 and a second acquisition chip 52. The first connection portion 511 of the first acquisition chip 51 is electrically connected to the first signal acquisition line 41, the second connection portion 512 of the first acquisition chip 51 is electrically connected to the power output line 42, and the third connection portion 513 of the first acquisition chip 51 is connected to the first adapter piece 31 of the shunt 3, which is the end of the shunt 3 near the negative terminal B- of the battery module 1. One end of the second acquisition chip 52 is electrically connected to the second signal acquisition line 43, and the other end is electrically connected to the second adapter piece 33 of the shunt 3, which is the end of the shunt 3 near the negative terminal P- of the external load. The first signal acquisition line 41 can be connected to the first voltage acquisition interface Current_P of the BMS, the second signal acquisition line 43 can be connected to the second voltage acquisition interface Current_N of the BMS, and the power output line 42 can be connected to the power supply interface and / or functional circuit ground of the BMS. By placing the BMS power output line 42 between the negative terminal B- of the battery module 1 and the negative terminal P- of the external load, the BMS grounding terminal can be closer to the battery module 1. This allows external static electricity to be absorbed by the battery module 1 more likely, rather than entering the BMS through the BMS grounding terminal. This avoids triggering the internal protection mechanism of the BMS and also provides filtering to reduce interference.

[0069] Furthermore, considering ease of processing and assembly, the second acquisition piece 52 can also adopt the same structure as the first acquisition piece 51; that is, in some embodiments, such as... Figure 3As shown, the second acquisition chip 52 includes a fourth connecting part 521, a fifth connecting part 522, and a sixth connecting part 523. The fourth connecting part 521 and the fifth connecting part 522 are spaced apart and electrically connected to the sixth connecting part 523. The fourth connecting part 521 is electrically connected to the second signal acquisition line 42. The fifth connecting part 522 is a non-overcurrent connection point of the BMS and can be used as a redundant spare interface. The sixth connecting part 523 is electrically connected to the shunt 3, such as the second adapter chip 33. The electrical connector 4 includes the second signal acquisition line 43 and a spare function connection line 44. In this way, the first acquisition chip 51 and the second acquisition chip 52 have the same structure, which can be manufactured uniformly, avoiding mixing of materials, etc., and bringing many conveniences to the production process.

[0070] In this case, the first signal acquisition line 41 can be connected to the first voltage acquisition interface Current_P of the BMS, the second signal acquisition line 43 can be connected to the second voltage acquisition interface Current_N of the BMS, the power output line 42 can be connected to the power supply interface and / or functional circuit ground of the BMS, and the spare functional connection line 44 can be connected to the BMS as a spare interface.

[0071] Of course, depending on specific needs, such a solution can also be used in other embodiments, such as... Figure 9 As shown, the battery pack also includes a second acquisition piece 52, and the electrical connector 4 also includes a second signal acquisition line 43. The second acquisition piece 52 is electrically connected to the second signal acquisition line 43 and the first adapter piece 31 of the shunt 3. The first adapter piece 31 is electrically connected to the negative terminal B- of the battery module 1. The third connection part 513 of the first acquisition piece 51 is electrically connected to the second adapter piece 33. The second adapter piece 33 is electrically connected to the negative terminal P- of the external load.

[0072] In other words, this embodiment adopts a combination of a first acquisition chip 51 and a second acquisition chip 52. The first connection portion 511 of the first acquisition chip 51 is electrically connected to the first signal acquisition line 41, the second connection portion 512 of the first acquisition chip 51 is electrically connected to the power output line 42, and the third connection portion 513 of the first acquisition chip 51 is connected to one end of the shunt 3 near the negative terminal P- of the external load. One end of the second acquisition chip 52 is electrically connected to the second signal acquisition line 43, and the other end is electrically connected to one end of the shunt 3 near the negative terminal B- of the battery module 1. The first signal acquisition line 41 can be connected to the second voltage acquisition interface Current_N of the BMS, the second signal acquisition line 43 can be connected to the first voltage acquisition interface Current_P of the BMS, and the power output line 42 can be connected to the power supply interface and / or functional circuit ground of the BMS.

[0073] It should be noted that the above embodiments do not limit the specific materials of the first acquisition piece 51 and the second acquisition piece 52. For example, the first acquisition piece 51 and the second acquisition piece 52 can be nickel sheets, copper sheets, or metal alloys, respectively. Furthermore, the above embodiments do not limit the specific materials of the first adapter piece 31 and the second adapter piece 33. For example, the first adapter piece 31 and the second adapter piece 33 can be metal sheets, such as copper busbars. The first adapter piece 31 and the second adapter piece 33 also serve to dissipate heat for the resistive piece 32.

[0074] Furthermore, such as Figure 5 As shown, in some embodiments, the width of the first connecting portion 511 is smaller than the width of the second connecting portion 512.

[0075] It is understandable that for the first acquisition chip 51, for example, for a nickel chip, the larger the width of the nickel chip, the larger its cross-sectional area, and therefore the smaller its resistance. That is, the resistance of the wider connection part is less than the resistance of the narrower connection part. Thus, in this embodiment, the width of the first connection part 511 is smaller than the width of the second connection part 512. In this way, when the working current of the BMS flows back, it will choose the wider second connection part 512 for the backflow, and will not generate a voltage drop on the narrower first connection part 511. In this way, the accuracy of the current acquisition by the narrower first connection part 511 can be ensured.

[0076] It should be noted that this embodiment does not limit the width of the first connecting portion 511 and the second connecting portion 512, nor the width ratio between them, as long as the width of the first connecting portion 511 is smaller than the width of the second connecting portion 512. In some embodiments, the width of the first connecting portion 511 ranges from 1mm to 3mm, and the width of the second connecting portion 512 ranges from 1mm to 10mm. This size range takes into account both signal transmission performance and manufacturing feasibility. For example, the width of the first connecting portion 511 can be 1.5mm, 2mm, or 2.5mm, etc.; the width of the second connecting portion 512 can be 2mm, 5mm, 8mm, or 10mm, etc. It should be noted that each size range in this embodiment includes endpoint values; therefore, endpoint values ​​will not be listed exemplarily.

[0077] Furthermore, in some embodiments, the width of the first connecting portion 511 ranges from 1.5mm to 2.5mm, and the width of the second connecting portion 512 ranges from 3mm to 7mm. For example, the width of the first connecting portion 511 is 2mm, and the width of the second connecting portion 512 is 4mm, 5mm, or 6mm. It can be seen that within this range, the width dimensions of the first connecting portion 511 and the second connecting portion 512 do not overlap, which facilitates the rapid determination of the respective values ​​of the first connecting portion 511 and the second connecting portion 512, thereby ensuring that the width of the first connecting portion 511 is less than the width of the second connecting portion 512. Moreover, limiting the width of the first connecting portion 511 to the range of 1.5mm to 2.5mm satisfies both signal transmission performance and manufacturing feasibility, ensuring that the width of the first connecting portion 511 is neither too narrow nor too wide, thus helping to ensure that the width of the first connecting portion 511 is less than the width of the second connecting portion 512, while simultaneously improving the mechanical strength and reliability of the first connecting portion 511. In addition, limiting the width of the second connection portion 512 to 3mm-7mm makes the width of the second connection portion 512 more suitable, which helps to reduce resistance, improve current carrying capacity, and avoid taking up too much space.

[0078] In addition, in some embodiments, the width of the second connecting portion 512 is at least twice the width of the first connecting portion 511, that is, the width ratio of the second connecting portion 512 to the first connecting portion 511 is greater than or equal to 2. For example, the width of the second connecting portion 512 is twice the width of the first connecting portion 511. This ratio takes into account both the size of the first acquisition piece 51 and the feasibility of the manufacturing process.

[0079] Furthermore, such as Figure 5 As shown, in some embodiments, a first U-shaped groove 514 is formed between the first connecting portion 511 and the second connecting portion 512.

[0080] It is understandable that a first U-shaped groove 514 can be formed on the first acquisition piece 51, so that a first connecting part 511 and a second connecting part 512 are formed on both sides of the first U-shaped groove 514. The setting of the first U-shaped groove 514 can avoid stress concentration on the narrower first connecting part 511 and the second connecting part 512 due to vibration transmission, reduce stress distribution, and avoid tearing damage.

[0081] Furthermore, this embodiment does not specifically limit the width of the first U-shaped groove 514. Considering the feasibility of the process and cost, in some embodiments, the width of the first U-shaped groove 514 ranges from 1mm to 25mm. For example, the width of the first U-shaped groove 514 is 5mm, 10mm, 15mm, or 20mm, etc. When the width of the first U-shaped groove 514 is within this range, relatively low processing costs and the required mechanical strength and reliability can be maintained.

[0082] Furthermore, in some embodiments, the width of the first U-shaped groove 514 ranges from 3mm to 15mm. For example, the width of the first U-shaped groove 514 is 4mm, 7mm, or 12mm, etc. It can be seen that compared to a width range of 1mm to 25mm for the first U-shaped groove 514, limiting the width of the first U-shaped groove 514 to 3mm to 15mm increases the minimum width of the first U-shaped groove 514, preventing it from being too narrow. This avoids current concentration at the edges, increases processing possibilities, and reduces processing costs. Additionally, reducing the maximum width of the first U-shaped groove 514 prevents it from being too wide, thus ensuring structural rigidity, mechanical strength, and reliability. It also prevents heat from concentrating at the first connecting portion 511 and the second connecting portion 512 due to the first U-shaped groove 514 being too wide, making heat dissipation difficult.

[0083] In addition, in order to ensure the reliability of the electrical connections between the first connection part 511, the second connection part 512 and the third connection part 513 and the first signal acquisition line 41, the power output line 42 and the shunt 3 respectively, in some embodiments, the first connection part 511 is provided with a first buffer part; and / or the second connection part 512 is provided with a second buffer part; and / or the third connection part 513 is provided with a third buffer part.

[0084] In other words, this embodiment provides buffer portions on the first connecting portion 511, and / or the second connecting portion 512, and / or the third connecting portion 513. These buffer portions provide movement space for the first acquisition piece 51 to compensate for processing or assembly errors, thereby ensuring that the first connecting portion 511 can be smoothly electrically connected to the first signal acquisition line 41, the second connecting portion 512 can be smoothly electrically connected to the power output line 42, and the third connecting portion 513 can be smoothly electrically connected to the shunt 3. This avoids interference and conflicts when the first acquisition piece 51 is electrically connected to the first signal acquisition line 41, the power output line 42, and the shunt 3 respectively. Furthermore, the buffer portions also have a shock-absorbing function, reducing vibration and impact.

[0085] For example, the first buffer section, the second buffer section, and the third buffer section can each be a bent step structure. That is, the buffer section can be formed using a bent step structure, and the bent step structure can be integrally formed with the first acquisition piece 51, which is simple in structure and easy to manufacture.

[0086] In addition, in some embodiments, the first connecting portion 511, the second connecting portion 512, and the third connecting portion 513 are arranged in a Y-shape.

[0087] Understandably, the first connecting part 511, the second connecting part 512, and the third connecting part 513 are arranged in a Y-shape, such that each pair of the three parts has an included angle, and the three parts intersect at a single point. The first connecting part 511, the second connecting part 512, and the third connecting part 513 extend in three directions, which facilitates the electrical connection of the first connecting part 511 to the first signal acquisition line 41, the second connecting part 512 to the power output line 42, and the third connecting part 513 to the shunt 3. Furthermore, the Y-shaped arrangement of the first connecting part 511, the second connecting part 512, and the third connecting part 513 also facilitates the side-by-side arrangement of the first signal acquisition line 41 and the power output line 42, while simultaneously allowing the electrical connector 4 and the shunt 3 to be located on opposite sides of the first acquisition piece 51.

[0088] Additionally, it should be noted that the above embodiments do not limit the specific method of connecting the first acquisition piece 51 and the second acquisition piece 52 to the splitter 3, as long as the connection and fixation of the first acquisition piece 51 and the second acquisition piece 52 to the splitter 3 can be achieved. For example, laser welding can be used between the first acquisition piece 51 and the splitter 3, and between the second acquisition piece 52 and the splitter 3, respectively.

[0089] In some embodiments, a first solder mark and a second solder mark are formed independently on the first acquisition chip 51; one end of the first solder mark is electrically connected to the first signal acquisition line 41 via the first connection part 511, and the other end is electrically connected to the shunt 3 via the third connection part 513; one end of the second solder mark is electrically connected to the power output line 42 via the second connection part 512, and the other end is electrically connected to the shunt 3 via the third connection part 513.

[0090] In other words, in this embodiment, by forming a first solder mark and a second solder mark on the first acquisition piece 51, the first solder mark serves as an electrical connection between the first connecting part 511 and the third connecting part 513, and the second solder mark serves as an electrical connection between the second connecting part 512 and the third connecting part 513. This facilitates a reliable electrical connection between the first connecting part 511 and the third connecting part 513, as well as between the second connecting part 512 and the third connecting part 513, resulting in lower contact impedance and more accurate signal acquisition. Furthermore, it can improve structural stability.

[0091] Further, exemplarily, the first solder mark is located within the extension region of the first connection portion 511, and the second solder mark is located within the extension region of the second connection portion 512. For example, the first solder mark is located on the extension line of the center line of the first connection portion 511, and the second solder mark is located on the extension line of the center line of the second connection portion 512. This ensures that the trajectories of the first and second solder marks are straight lines, minimizing the length of the first and second solder marks, resulting in lower contact impedance and more accurate signal acquisition.

[0092] Furthermore, in some embodiments, a first conductive adhesive is provided between the first connecting portion 511 and the electrical connector 4; and / or a second conductive adhesive is provided between the second connecting portion 512 and the electrical connector 4; and / or a third conductive adhesive is provided between the third connecting portion 513 and the electrical connector 4.

[0093] In other words, this embodiment adds conductive adhesive between the first connecting part 511, and / or the second connecting part 512, and / or the third connecting part 513 and the electrical connector 4. The conductive adhesive is used to improve the connection strength, avoid the soldering from damaging the structural strength of the relatively narrow connecting parts (such as the first connecting part 511 and the second connecting part 512), and reduce internal resistance and heat generation.

[0094] It should be noted that when the second acquisition piece 52 has the same structure as the first acquisition piece 51, the specific settings of the fourth connecting part 521, the fifth connecting part 522 and the sixth connecting part 523 of the second acquisition piece 52 can refer to the first connecting part 511, the second connecting part 512 and the third connecting part 513 of the first acquisition piece 51. In addition, a second U-shaped groove 524 can be formed between the fourth connecting part 521 and the fifth connecting part 522. The specific dimensions of the second U-shaped groove 524 can refer to the specific dimension range of the first U-shaped groove.

[0095] In addition, in the above embodiments, in order to achieve the connection between the shunt 3 and the battery module 1, such as... Figure 3 As shown, in some embodiments, the first adapter piece 31 and the second adapter piece 33 are respectively provided with fixing holes 311, and the shunt 3 is fixed to the battery module 1 by fasteners 312 passing through the fixing holes 311.

[0096] In other words, this embodiment uses fasteners 312 to fix the first adapter 31 and the second adapter 33 to the battery module 1 by setting fixing holes 311 on the first adapter 31 and the second adapter 33, thereby realizing the physical connection between the shunt 3 and the battery module 1, ensuring the stability of the position of the shunt 3 and improving the reliability of the connection between the shunt 3 and the battery module 1.

[0097] Additionally, it should be noted that the above embodiments do not limit the specific structure of the electrical connector 4. For example, the electrical connector 4 can be an FPC flexible flat cable, an FFP flat cable, or a wire, etc.

[0098] Furthermore, the above embodiments do not limit the connection method between the first acquisition piece 51 and the second acquisition piece 52 and the electrical connector 4, as long as the connection between the first acquisition piece 51 and the second acquisition piece 52 and the electrical connector 4 can be achieved. For example, the first acquisition piece 51 and the second acquisition piece 52 can be welded to the electrical connector 4 to achieve a physical connection and fixation between the first acquisition piece 51 and the second acquisition piece 52 and the electrical connector 4, ensuring the reliability of the structure. It can be understood that the electrical connection between the first acquisition piece 51 and the electrical connector 4 is achieved by the first connecting part 511 electrically connecting to the first signal acquisition line 41 and the second connecting part 512 electrically connecting to the power output line 42, and the electrical connection between the second acquisition piece 52 and the electrical connector 4 is achieved by the second acquisition piece 52 electrically connecting to the second signal acquisition line 43.

[0099] Furthermore, the above embodiments do not limit the specific connection method between the electrical connector 4 and the BMS, as long as the connection between the electrical connector 4 and the BMS can be achieved. For example, the end of the electrical connector 4 used for connection with the BMS is provided with gold fingers, which can be connected to the BMS by soldering. This solution is reliable and low-cost.

[0100] Of course, in other embodiments, the electrical connector 4 and the BMS can also be connected by means of pin header and terminal plug-in.

[0101] Additionally, when electrical connector 4 is a flexible connector, to avoid the flexible connector being bent at sharp angles or 90 degrees, or due to vibration, which could cause high impedance or signal breakage, etc., as follows: Figure 3 As shown, in some embodiments, the electrical connector 4 is a flexible connector, the battery module 1 is provided with a boss 6, the flexible connector is arranged along the surface of the boss 6, and the surface of the boss 6 for contacting the flexible connector is provided with a buffer.

[0102] In other words, this embodiment provides support for the flexible connector by setting the boss 6. The surface shape of the boss 6 provides accurate route positioning for the flexible connector, so that the flexible connector is constrained by the surface position of the boss 6 and finally connects to the BMS after bending along the surface of the boss 6. The design of the surface structure of the boss 6 can avoid excessive bending of the flexible connector. In addition, the buffer is set on the surface of the boss 6 that contacts the flexible connector, which can absorb the vibration of the flexible connector and avoid direct hard contact between the flexible connector and the boss 6, thereby avoiding wear of the flexible connector. That is, by setting the boss 6 and the buffer, the reliability of the flexible connector structure can be improved, so as to solve the problem of excessive impedance or signal breakage caused by long-term bending and vibration of the flexible connector.

[0103] It should be noted that this embodiment does not limit the specific structure and material of the buffer. For example, the buffer can be a sponge.

[0104] In addition, such as Figure 3 As shown, in order to facilitate the positioning of the electrical connector 4, in some embodiments, one of the battery module 1 and the electrical connector 4 is provided with a positioning post 11, and the other is provided with a positioning hole for cooperating with the positioning post 11 for limiting the position.

[0105] In other words, this embodiment uses the cooperation of the positioning post 11 and the positioning hole to achieve the installation and positioning of the electrical connector 4, so as to ensure that the electrical connector 4 has the correct position. This is conducive to accurately positioning the connection positions of the first acquisition piece 51 and the second acquisition piece 52 with the shunt 3 respectively, effectively controlling the acquisition point spacing of the first acquisition piece 51 and the second acquisition piece 52, thereby ensuring the reliability of the voltage acquisition error at both ends of the shunt 3.

[0106] In addition to the battery pack described above, this utility model also provides an electrical device that includes the battery pack disclosed in the above embodiments. For the structure of other parts of the electrical device, please refer to the relevant technology, which will not be described in detail here.

[0107] It should be noted that this embodiment does not limit the specific type and structure of the electrical equipment, as long as it uses the battery pack disclosed in the above embodiment. For example, the electrical equipment can be an electric vehicle, an energy storage system, or an electronic device.

[0108] The key point of this embodiment is that the electrical device uses the battery pack disclosed in the above embodiments, and at least includes the beneficial effects of the battery pack, which will not be repeated here.

[0109] It should also be noted that, in this specification, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0110] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0111] The battery pack and electrical equipment provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: The housing (9), and the battery module (1), battery management system (2), shunt (3), electrical connector (4) and first acquisition chip (51) located inside the housing (9). One end of the shunt (3) is electrically connected to the battery module (1), and the other end is connected to an external load; The electrical connector (4) includes a first signal acquisition line (41) and a power output line (42) arranged independently. One end of the electrical connector (4) is electrically connected to the battery management system (2), and the other end extends to one side of the shunt (3). The first acquisition chip (51) includes a first connection part (511), a second connection part (512) and a third connection part (513). The first connection part (511) and the second connection part (512) are spaced apart and electrically connected to the third connection part (513). The first connection part (511) is electrically connected to the first signal acquisition line (41), the second connection part (512) is electrically connected to the power output line (42), and the third connection part (513) is electrically connected to the shunt (3).

2. The battery pack according to claim 1, characterized in that, The shunt (3) includes a first adapter plate (31), a resistor plate (32), and a second adapter plate (33) connected in sequence. The first adapter plate (31) is connected to the negative terminal (B-) of the battery module (1), and the second adapter plate (33) is connected to the negative terminal (P-) of the external load. The third connection part (513) is electrically connected to the first adapter plate (31). The battery pack also includes a second acquisition chip (52), and the electrical connector (4) also includes a second signal acquisition line (43). The two ends of the second acquisition chip (52) are electrically connected to the second signal acquisition line (43) and the second adapter chip (33), respectively.

3. The battery pack according to claim 1 or 2, characterized in that, The width of the first connecting portion (511) is smaller than the width of the second connecting portion (512); and / or The width of the first connecting part (511) ranges from 1mm to 3mm, and the width of the second connecting part (512) ranges from 1mm to 10mm. Preferably, the width of the first connecting part (511) is in the range of 1.5mm-2.5mm, and the width of the second connecting part (512) is in the range of 3mm-7mm.

4. The battery pack according to claim 1 or 2, characterized in that, A first U-shaped groove (514) is formed between the first connecting part (511) and the second connecting part (512). The width of the first U-shaped groove (514) ranges from 1mm to 25mm; Preferably, the width of the first U-shaped groove (514) is in the range of 3mm-15mm.

5. The battery pack according to claim 1 or 2, characterized in that, The first connecting portion (511) is provided with a first buffer portion; and / or, The second connecting portion (512) is provided with a second buffer portion; and / or, The third connecting part (513) is provided with a third buffer part.

6. The battery pack according to claim 1 or 2, characterized in that, The first connecting part (511), the second connecting part (512) and the third connecting part (513) are arranged in a Y-shape.

7. The battery pack according to claim 1 or 2, characterized in that, The first acquisition piece (51) has independently arranged first and second solder marks; One end of the first solder mark is electrically connected to the first signal acquisition line (41) via the first connecting part (511), and the other end is electrically connected to the shunt (3) via the third connecting part (513). One end of the second solder mark is electrically connected to the power output line (42) via the second connection part (512), and the other end is electrically connected to the shunt (3) via the third connection part (513).

8. The battery pack according to claim 1 or 2, characterized in that, A first conductive adhesive is provided between the first connecting part (511) and the electrical connector (4); and / or, A second conductive adhesive is provided between the second connecting part (512) and the electrical connector (4); and / or, A third conductive adhesive is provided between the third connecting part (513) and the electrical connector (4).

9. The battery pack according to claim 1 or 2, characterized in that, The electrical connector (4) is a flexible connector. The battery module (1) is provided with a boss (6). The flexible connector is arranged along the surface of the boss (6). The surface of the boss (6) that is used to contact the flexible connector is provided with a buffer.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-9.

Images