Battery signal acquisition terminal, CCS assembly and battery pack

Abstract

The utility model relates to the technical field of battery signal acquisition, in particular to a battery signal acquisition terminal, a CCS assembly and a battery pack. Wherein the battery signal acquisition terminal comprises a metal sheet, the metal sheet comprises a body part and a bending part extending from a first end part of the body part, the bending part comprises a first arm, a second arm and a third arm which sequentially extend from the first end part, the first arm and the third arm are opposite to each other, and the first arm and the second arm are opposite to each other. And a third arm defining a third end of the metal sheet, the third arm including: a first portion extending from the second arm; a second portion extending from a first end of the first portion in a curved manner with respect to the first portion, and a second end of the second portion defining the third end portion, the second end portion defining the third end portion in an opposite direction of the first arm and the second arm, at least a portion of the second end is further away from the first arm than the second portion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery signal acquisition, and in particular to a battery signal acquisition terminal, a CCS assembly and a battery pack. BACKGROUND

[0002] Patent document No. CN221407408U (patent document 1) discloses a terminal component for collecting battery signals, the conductive sheet (metal sheet) of the terminal component has a clamping protrusion (bent portion) formed by bending. In implementation, the initial positioning of the terminal at the mounting position of the busbar can be achieved by embedding the clamping protrusion into the opening portion of the busbar, and then the welding of the metal sheet and the busbar is facilitated. However, for the terminal component proposed in patent document 1, when the metal sheet is pressed onto the surface of the busbar by a pressing device to pre-implement welding, the clamping protrusion originally embedded into the opening portion (clamping groove) of the busbar is likely to be tilted out due to the aforementioned pressing action, and thus is detached from the opening portion, resulting in poor positioning effect and burrs on the surface of the conductive busbar.

[0003] In addition, especially in the case of using a laser welding process, in order to ensure the welding strength of the metal sheet and the busbar, it is necessary to press the metal sheet onto the busbar by using a pressing device, so that the surface of the metal sheet and the surface of the busbar are well fitted, and then welding is implemented. If the fitting degree of the surface of the metal sheet and the surface of the busbar is poor and there is a gap, the welding strength will be significantly reduced, and the terminal is likely to be accidentally detached from the busbar during use. However, the inventors found that in the case where the metal sheet is pressed onto the busbar by the pressing device, due to the influence of the shape of the opening portion and the connection between the first bent arm and the metal sheet, the metal sheet is difficult to well fit to the surface of the busbar, and thus the welding quality is not high. SUMMARY

[0004] In order to solve at least one of the above technical problems, the present application proposes a battery signal acquisition terminal, a CCS assembly and a battery pack.

[0005] In a first aspect, a battery signal acquisition terminal is proposed, comprising a metal sheet, the metal sheet comprising a body portion and a bent portion extending from a first end portion of the body portion, the bent portion comprising a first arm, a second arm and a third arm extending in sequence from the first end portion, the first arm and the third arm being opposite to each other, and the third arm defining a third end portion of the metal sheet, the third arm comprising:

[0006] a first portion extending from the second arm;

[0007] The second portion extends from the first end of the first portion in a manner curved relative to the first portion, and a second end of the second portion defines the third end, at least a portion of the second end being farther from the first arm than the second portion in the opposite direction of the first arm and the second arm.

[0008] In some possible implementations, the second portion extends from the first end in a manner gradually farther from the first arm and the second arm.

[0009] In some possible implementations, a portion of the second end farthest from the first arm in the opposite direction is formed as a sharp corner, a tip of the sharp corner is formed as a straight line shape extending in a second direction, and the tip points to a direction away from the first arm, the second direction being perpendicular to the opposite direction.

[0010] In some possible implementations, the body portion includes a flat portion extending in the opposite direction and defining the first end.

[0011] In some possible implementations, the body portion includes a wire crimping portion provided at a second end of the flat portion, the second end and the first end being oppositely arranged along the opposite direction.

[0012] In some possible implementations, the flat portion has a first surface and a second surface oppositely arranged in a thickness direction perpendicular to the opposite direction, and the third arm is entirely located on the first surface side when viewed in the opposite direction.

[0013] In some possible implementations, further comprising:

[0014] A temperature sensor, mechanically connected to the metal sheet and electrically isolated from the metal sheet.

[0015] In a second aspect, a CCS assembly is provided, comprising:

[0016] The battery signal acquisition terminal of the first aspect;

[0017] A busbar having a third surface and an opening portion recessed from the third surface, the opening portion having a first inner wall surface and a second inner wall surface opposite to each other in the opposite direction, the busbar being configured to electrically connect adjacent battery cells in a battery pack;

[0018] The bending portion is embedded in the opening portion, and the second portion of the second arm abuts against the second inner wall surface, and the body portion is welded to the third surface.

[0019] In some possible implementation manners, the first portion abuts against the second inner wall surface, and the third arm generates elastic deformation close to the first arm due to the abutment of the second inner wall surface against the first portion and the second portion.

[0020] In a third aspect, a battery pack is provided, comprising the CCS assembly according to the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only related to some embodiments of the present application, but not limited to the present application.

[0022] Figure 1 is a schematic view of a part of the CCS assembly provided by the embodiments of the present application.

[0023] Figure 2 is Figure 1 is a schematic view of a busbar.

[0024] Figure 3 is Figure 1 is a perspective view of a first battery signal acquisition terminal in the CCS assembly.

[0025] Figure 4 is Figure 3 is a side view of the CCS assembly.

[0026] Figure 5 is Figure 1 is a perspective view of a second battery signal acquisition terminal in the CCS assembly.

[0027] Figure 6 is Figure 5 is a side view of the CCS assembly.

[0028] LIST OF REFERENCES:

[0029] DR1-first direction, DR2-second direction, DR3-third direction;

[0030] 1000-CCS assembly;

[0031] 100-battery signal acquisition terminal, 200-busbar;

[0032] 100R-first battery signal acquisition terminal, 100L-second battery signal acquisition terminal;

[0033] 10-metal sheet, 10a-third end portion;

[0034] 20-wire, 30-temperature sensor

[0035] 1-body portion;

[0036] 11 - flat portion, 1a - first end portion, 1 lb - second end portion, 1 lc - first surface, 1 ld - second surface;

[0037] 12 - wire crimping portion;

[0038] 2 - bent portion;

[0039] 21 - first arm;

[0040] 22 - second arm;

[0041] 23 - third arm, 231 - first portion, 231a - first end, 232 - second portion, 232a - second end, 232b - sharp corner;

[0042] 3 - slit;

[0043] 4 - third surface;

[0044] 5 - opening portion, 51 - first inner wall surface, 52 - second inner wall surface. DETAILED DESCRIPTION

[0045] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without any creative effort fall within the scope of protection of the present application. It can be understood that some technical means of the various embodiments described herein can be replaced or combined with each other without conflict.

[0046] In the description of the present application, if there are terms such as "first", "second", etc., they are only used to distinguish the described objects, and do not have any order or technical meaning. Therefore, the objects defined with "first", "second", etc. can explicitly or implicitly include one or more of the objects, and for example, the term "first element" itself does not mean the existence of "second element", and the term "second element" itself does not mean the existence of "first element". In addition, "one" or "an" and the like do not represent a quantity limitation, but represent the existence of at least one, and "multiple" represents no less than two.

[0047] In the description of the present application, the terms "include", "have" indicate the existence of the described features, numbers, operations, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, numbers, operations, elements and / or their combinations.

[0048] In the description of the present application, reference to "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrases "in one embodiment", "in some embodiments", "in other embodiments", "in additional embodiments", and so on, in various places in the specification are not necessarily all referring to the same embodiment, unless otherwise specifically specified

[0049] Figure 1 A part of a CCS (Cells Contact System) assembly 1000 provided by an embodiment of the present application is schematically shown, which includes a busbar 200 and a first battery signal acquisition terminal 100R and a second battery signal acquisition terminal 100L welded to the busbar 200. The first battery signal acquisition terminal 100R (hereinafter, sometimes simply referred to as terminal 100R) can be used to acquire a voltage signal of a battery pack, particularly a battery cell in the battery pack, and the second battery signal acquisition terminal 100L (hereinafter, sometimes simply referred to as terminal 100L) can be used to acquire a temperature signal of the battery pack, particularly the battery cell in the battery pack.

[0050] In the following description, when it is not necessary to deliberately distinguish the first battery signal acquisition terminal 100R and the second battery signal acquisition terminal 100L, they are collectively referred to as a battery signal acquisition terminal 100 or a terminal 100.

[0051] The busbar 200 can be an aluminum busbar or a copper busbar, which is used to electrically connect adjacent battery cells in a battery pack to achieve electrical grouping of the battery cells. The busbar 200 has a flat third surface 4 and an opposite surface opposite to the third surface 4 and recessed from the third surface 4. In use, the opposite surface of the busbar 200 can be attached to a battery pack body to achieve large-area thermal contact with the battery pack body, and the third surface 4 faces away from the battery pack body. Figure 1 In the middle, the opposite surface is not visible due to the angle of view. In use, the opposite surface of the busbar 200 can be attached to the battery pack body to achieve large-area thermal contact with the battery pack body, and the third surface 4 faces away from the battery pack body.

[0052] The busbar 200 also has an opening portion 5 recessed from the third surface 4, which can be a through-hole structure or a groove structure with a closed bottom. The opening portion 5 is formed in a rectangular shape and has a first inner wall surface 51 and a second inner wall surface 52 oppositely arranged in a first direction DR1.

[0053] Please refer to the drawings and Figures 1 to 6The terminal 100 includes a metal sheet 10, which can be a nickel sheet, including a body portion 1 and a bent portion 2 extending from a first end portion la of the body portion 1, wherein the body portion 1 is welded to the third surface 4 of the bus bar 200, and the bent portion 2 is inserted into the opening portion 5 of the bus bar 200. In assembly, the bent portion 2 of the terminal 100 can be inserted into the opening portion 5 of the bus bar 200 to achieve a complete positioning of the assembly of the terminal 100 and the bus bar 200, and then the body portion 1 is welded to the third surface 4 of the bus bar 200.

[0054] The body portion 1 includes a flat portion 11 and a wire crimping portion 12.

[0055] The flat portion 11 is formed in a rectangular shape extending in a first direction DR1 and a second direction DR2 perpendicular to each other, and defines the aforementioned first end portion la of the body portion 1, i.e., the flat portion 11 has the aforementioned first end portion la. Moreover, the flat portion 11 has a second end portion lib disposed opposite to the first end portion la in the first direction DR1, and has a first surface lie and a second surface lid disposed opposite to each other in a thickness direction thereof, i.e., a third direction DR3, which is perpendicular to the first direction DR1 and the second direction DR2, respectively. The first surface lie is welded to the third surface 4 in a manner of abutting against the third surface 4.

[0056] The wire crimping portion 12 is integrally connected to the second end portion lib of the flat portion 11.

[0057] For the terminal 100R, the wire crimping portion 12 thereof has two pairs of clamping jaws arranged apart in the first direction DR1, each pair of clamping jaws being disposed opposite to each other in the first direction DR1. By deforming each pair of clamping jaws by applying a pressing force thereon in a manner of approaching each other, an end portion of the wire 20 for transmitting a signal is crimped and fixed between each pair of clamping jaws. Moreover, one pair of clamping jaws close to the flat portion 11 can crimp a stripped core of the wire 20, and the other pair of clamping jaws away from the flat portion 11 can crimp an insulating cover of the wire 20.

[0058] For the terminal 100L, the wire crimping portion 12 thereof is formed in a cylindrical shape. The wire 20 with a temperature sensor 30 (thermistor) carried thereon is inserted into a hole cavity of the cylindrical wire crimping portion 12, and by deforming the wire crimping portion 12 by applying a pressing force thereon in a manner of inwardly radially, the temperature sensor 30 is crimped and fixed inside the cylindrical wire crimping portion 12, whereby the temperature sensor 30 is mechanically fixed with the metal sheet 10. In this way, the temperature of the battery pack, particularly the battery cell, is transmitted to the temperature sensor 30 via the bus bar 200 and the metal sheet 10, so that the temperature of the battery pack can be determined. In addition, the temperature sensor 30 should be encapsulated by an insulating resin, so that an electrical device inside the temperature sensor 30 is electrically isolated from the metal sheet 10.

[0059] The bending portion 2 is formed in a substantially U-shape, which includes a first arm 21, a second arm 22 and a third arm 23 successively extending from the first end portion la of the body portion 1 (also the end portion of the flat portion 11), the first arm 21 and the third arm 23 are opposite to each other along the first direction DR1, and the third arm 23 defines one end portion of the metal sheet 10, i.e. the third end portion 10a. The first arm 21 is substantially perpendicular to the flat portion 11 of the body portion 1, and the third arm 23 is substantially parallel to the flat portion 11 of the body portion 1.

[0060] The third arm 23 includes a first portion 231 and a second portion 232. The first portion 231 extends substantially perpendicularly from the second arm 22. The second portion 232 extends from a first end 231a of the first portion 231 (i.e. the end of the first portion 231 away from the second arm 22) in a manner bent relative to the first portion 231, and a second end 232a of the second portion 232 defines the third end portion 10a of the metal sheet 10. Moreover, at least a portion of the second end 232a is further away from the first arm 21 than the second portion 232 in the opposite direction of the first arm 21 and the second arm 22, i.e. the first direction DR1. Therefore, when the bending portion 2 of the terminal 100 is embedded in the opening portion 5 of the busbar 200, the second portion 232 (particularly the second end 232a) of the third arm 23 will abut against the second inner wall surface 52 of the opening portion 5, so that the bending portion 2, particularly the third arm 23, can be inhibited from running out of the opening portion 5 when the body portion 1 is pressed towards the third surface 4 of the busbar 200.

[0061] In the present embodiment, the second portion 232 extends from the first end 231a of the first portion 231 in a manner bent relative to the first portion 231 away from the first arm 21 and the second arm 22, and the second portion 232 is formed in a flat structure relatively long in the second direction DR2.

[0062] In addition, the portion of the second end 232a most away from the first arm 21 in the first direction DR1 is formed as a sharp corner 232b defined by two intersecting and parallel surfaces extending in the second direction DR2, so that the tip of the sharp corner 232b is in a linear shape extending in the second direction DR2. Moreover, the tip points away from the first arm 21, and the tip points in the first direction DR1. By such design, when the bending portion 2 of the terminal 100 is embedded in the opening portion 5 of the busbar 200, the tip of the sharp corner 232b abuts and slightly bites into the second inner wall surface 52 of the opening portion 5 in a line contact manner, so as to improve the engagement strength between the second portion 232 of the third arm 23 and the second inner wall surface 52, and thereby improve the engagement strength between the bending portion 2 and the opening portion 5.

[0063] The metal sheet 10 can be obtained based on blanking (and bending) processing of a thin sheet metal, and the sharp corner 232b on the third arm 23 is obtained by blanking of the thin sheet metal, i.e., the sharp corner 232b corresponds to a blanking boundary of the thin sheet metal.

[0064] The size of the second portion 232 is significantly smaller than the size of the first portion 231, and based on this, when the bent portion 2 is embedded into the opening portion 5, the first portion 231 also abuts against the second inner wall surface 52, and due to the reverse abutment of the second inner wall surface 52 against the first portion 231 and the second portion 232, the third arm 23 generates elastic deformation close to the first arm 21. In this way, it helps to further improve the engagement strength of the third arm 23 with the second inner wall surface 52.

[0065] In other embodiments, the metal sheet 10 does not have the wire crimping portion 12, but is welded to the circuit board with the temperature sensor 30 through the scheme of the patent document CN221407408 U.

[0066] In some embodiments, the CCS assembly 1000 includes a plurality of busbars 200, and at least one terminal 100R and / or at least one terminal 100L is welded on each busbar 200.

[0067] Please also refer to Figure 4 For the first battery signal acquisition assembly 100L, when viewed in the first direction DR1, the third arm 23 is entirely located on the side of the first surface 11c of the flat portion 11. Through such a design, when the bent portion 2 of the metal sheet 10 is fitted into the opening portion 5 of the busbar 200, the third arm 23, especially the second portion 232 of the third arm 23, can easily enter the opening portion 5 completely, thereby reliably abutting against the second inner wall surface 52 of the opening portion 5.

[0068] In particular in the case of using a laser welding process, in order to ensure the welding strength of the flat portion 11 of the body portion 1 to the busbar 200, it is necessary to press the flat portion 11 onto the busbar 200 by using a pressing device, so that the first surface 11c of the flat portion 11 is better fitted with the third surface 4 of the busbar 200, and then welding is performed. If the fitting degree of the first surface 11c and the third surface 4 is poor and there is a gap, the welding strength will be significantly reduced, and the terminal 100 is likely to be accidentally detached from the busbar 200 during use.

[0069] However, the inventors found that, in the case where the pressing device presses the flat portion 11 of the terminal 100 to the bus bar 200, the first end portion la of the body portion 1 is difficult to well conform to the third surface 4 of the bus bar 200 due to the influence of the shape of the edge of the opening portion 5 and the joint of the first arm 21 and the body portion 1, and thus the part of the flat portion 11 close to the first end portion la also cannot well conform to the third surface 4 of the bus bar 200. In view of this, the embodiments of the present application solve this problem by the following design:

[0070] Please refer to Figure 3 and Figure 5 and refer to Figure 1 A slit 3 extending along the second direction DR2 is formed at the joint of the first arm 21 and the flat portion 11 of the bending portion 2. By providing the slit 3 at the joint of the first arm 21 and the flat portion 11, the structural strength of the metal sheet 10 at the part is reduced, and thus, when the pressing device presses the flat portion 11 of the terminal 100 to the bus bar 200, the first end portion la of the body portion 1 is more easily deformed towards the third surface 4 to better conform to the third surface 4 of the bus bar 200, and thus the entire first surface lib of the flat portion 11 can better conform to the third surface 4 of the bus bar 200, thereby helping to improve the welding strength of the terminal 100 and the bus bar 200.

[0071] And in the present embodiment, the slit 3 occupies a part of the first end portion la and a part of the first arm 21. By such a design, when the pressing device presses the flat portion 11 of the terminal 100 to the bus bar 200, the first end portion la of the body portion 1 is more easily deformed towards the third surface 4. In manufacturing, the slit 3 can be obtained by punching out a part of the thin sheet metal material at the first end portion la and a part of the thin sheet metal material at the root of the first arm 21 in a punch slit manner before the first arm 21 is bent.

[0072] In some embodiments, the aforementioned slit 3 can be configured in multiple, multiple slits 3 extending along the second direction DR2 and spaced apart along the second direction DR2.

[0073] In some embodiments, the aforementioned slit 3 can be replaced by a circular hole. For example, multiple circular holes pass through the metal sheet 10 at the joint of the flat portion 11 and the first arm 21, and are arranged spaced apart along the second direction DR2. Obviously, the slit 3 and the circular hole can both be referred to as an opening.

[0074] It can also be understood that, when the pressing device presses the flat part 11 of the terminal 100 to the bus bar 200, compared with the case where no slits 3 or holes are arranged at the connection between the body part 1 and the first arm 21, the design of the present embodiment makes the bending part 2, especially the third arm 23 thereof, less likely to be outwardly buckled relative to the opening part 5, that is, the third arm 23 can be better inhibited from being away from the opening part 5.

[0075] It can be understood that the terminal 100 described above can also be welded to the surface of other objects (for example, end clamping plates of the battery pack) of the battery device to collect relevant signals of the battery device via the other objects.

[0076] The embodiments of the present application also provide a battery pack, which comprises a plurality of battery monomers and the aforementioned CCS assembly 1000.

Claims

1. A battery signal collection terminal comprising a metal sheet including a body portion and a bent portion extending from a first end portion of the body portion, the bent portion including a first arm, a second arm, and a third arm extending in order from the first end portion, the first arm and the third arm being opposite to each other, and the third arm defining a third end portion of the metal sheet, characterized in that, The third arm includes: a first portion extending from the second arm; a second portion extending from a first end of the first portion in a manner bent with respect to the first portion, and a second end of the second portion defines the third end portion, at least a portion of the second end is farther away from the first arm than the second portion in an opposite direction of the first arm and the second arm.

2. The battery signal acquisition terminal of claim 1, wherein, The second portion extends from the first end in a manner gradually farther away from the first arm and the second arm.

3. The battery signal acquisition terminal of claim 1, wherein, A portion of the second end that is farthest away from the first arm in the opposite direction is formed as a sharp corner, a tip of the sharp corner is formed as a straight line shape extending in a second direction, and the tip points in a direction away from the first arm, the second direction being perpendicular to the opposite direction.

4. The battery signal acquisition terminal of claim 1, wherein, The body portion includes a flat portion extending in the opposite direction and defining the first end portion.

5. The battery signal acquisition terminal of claim 4, wherein, The body portion includes a wire crimping portion provided at a second end portion of the flat portion, the second end portion and the first end portion being oppositely arranged in the opposite direction.

6. The battery signal acquisition terminal of claim 4, wherein, The flat portion has a first surface and a second surface oppositely arranged in a thickness direction perpendicular to the opposite direction, and the third arm is entirely located on the first surface side when viewed in the opposite direction.

7. The battery signal acquisition terminal of claim 1, wherein, Further comprising: a temperature sensor mechanically connected to the metal sheet and electrically isolated from the metal sheet.

8. A CCS assembly characterized in that, Comprising: a battery signal acquisition terminal according to any one of claims 1 to 7; a bus bar having a third surface and an opening portion recessed from the third surface, the opening portion having a first inner wall surface and a second inner wall surface opposite to each other in the opposite direction, the bus bar being used to electrically connect adjacent battery cells in a battery pack; wherein the bent portion is embedded in the opening portion, and the second portion of the second arm abuts against the second inner wall surface, and the body portion is welded to the third surface.

9. The CCS assembly of claim 8, wherein, The first portion abuts against the second inner wall surface, and the third arm generates an elastic deformation close to the first arm due to the abutment of the second inner wall surface against the first portion and the second portion.

10. A battery pack characterized by comprising: A CCS assembly according to claim 8 or 9.

Images