Battery, terminal equipment and laser penetration welding detection method

Abstract

The invention provides a battery, terminal equipment and a laser penetration welding detection method. The battery comprises a battery cell and a protection plate, the battery cell comprises a battery cell body and an electrode terminal, and the protection plate comprises a substrate and a conductive piece. The substrate at least comprises a first circuit layer and a second circuit layer. The first circuit layer comprises a first body area and a detection point. The second circuit layer comprises an island area which is electrically connected with the detection points. The electrode terminal, the conductive part, the first body area and the island area are stacked in the first direction. Along the first direction, a welding part is formed in an overlapping welding area of the conductive piece and the electrode terminal, and the welding part is located in the island area when observed along the first direction. Therefore, according to the battery, the terminal equipment and the laser weld penetration detection method provided by the invention, whether the battery protection plate is welded penetration or not can be detected, so that the risk that a fault battery flows into a client side or even a consumer side is reduced.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a battery, a terminal device, and a laser welding penetration detection method. Background Art

[0002] The battery protection board is usually a multi-layer circuit structure, and a conductive member is usually provided on the battery protection board. One side of the conductive member is welded to the electrode terminal of the battery cell, and the opposite side is welded to the battery protection board, thereby realizing the electrical connection between the battery cell and the battery protection board. At this time, along the thickness direction of the battery protection board, the electrode terminal of the battery cell, the conductive member, and the battery protection board are stacked in sequence.

[0003] Based on the above structure, when laser welding the electrode terminals and conductive parts of the battery cell, if the laser power is abnormal, the laser may weld through the battery protection board, thereby connecting different layers of circuits in the multi-layer circuit and short-circuiting, causing battery failure. Summary of the invention

[0004] The present application provides a battery, a terminal device and a laser welding penetration detection method, which can detect whether the protection plate of the battery is welded through, thereby reducing the risk of faulty batteries flowing into the client end or even the consumer end.

[0005] In a first aspect, the present application provides a battery, including a battery cell and a protection plate, wherein the battery cell includes a battery cell body and an electrode terminal, and the protection plate includes: a substrate, wherein the substrate includes at least a first circuit layer and a second circuit layer stacked along a first direction, wherein the first direction is the thickness direction of the substrate, wherein the first circuit layer includes a first body region and a detection point, wherein the first body region is electrically isolated from the detection point, and wherein the second circuit layer includes an island region, wherein the island region is electrically connected to the detection point. A conductive member, wherein along the first direction, the electrode terminal, the conductive member, the first body region, and the island region are stacked, wherein one side of the conductive member is connected to the first body region and electrically connected, and the other side of the conductive member is welded to the electrode terminal and electrically connected, wherein along the first direction, the region where the conductive member and the electrode terminal overlap and are welded forms a welding portion, and when viewed along the first direction, the welding portion is located within the island region.

[0006] In combination with the first aspect, in a possible implementation manner, the second circuit layer further includes a second body region, the island region is electrically isolated from the second body region, and the first body region is electrically isolated from the second body region.

[0007] In combination with the first aspect, in a possible implementation manner, the island area is electrically connected to the detection point through a via.

[0008] In combination with the first aspect, in a possible implementation manner, the via includes a blind hole from the detection point to the island area.

[0009] In combination with the first aspect, in a possible implementation, the battery also includes a connector, the substrate includes a connector pad, the connector includes a first pin, the connector pad includes a first pin pad, the first pin is welded to the first pin pad, the first pin pad is electrically isolated from the first body area, and the first pin pad is electrically connected to the detection point.

[0010] In combination with the first aspect, in a possible implementation, the connector further includes a second pin, the connector pad further includes a second pin pad, the second pin pad is welded to the second pin, the second pin is electrically isolated from the first pin, and the second pin pad is electrically connected to the conductive member.

[0011] In combination with the first aspect, in a possible implementation manner, the conductive member is a flat metal member.

[0012] In combination with the first aspect, in a possible implementation manner, the polarity of the conductive member is different from the polarity of the island region.

[0013] In a second aspect, the present application provides a terminal device, comprising a battery provided in any possible implementation manner of the first aspect.

[0014] In a third aspect, the present application provides a laser welding penetration detection method, which is applied to a battery provided in any possible implementation of the first aspect, and the detection method includes: obtaining power parameters between the conductive member and the detection point. If the power parameters meet the preset conditions, it is determined that the conductive member and the first body area are laser welded.

[0015] In combination with the third aspect, in a possible implementation, the power parameter includes current, and the power parameter meets a preset condition, including that the current between the conductive member and the detection point is greater than a preset current threshold.

[0016] In combination with the third aspect, in a possible implementation, the power parameter includes resistance, and the power parameter meets a preset condition, including that the resistance between the conductive member and the detection point is less than a preset resistance threshold.

[0017] The present application sets an island area in the second circuit layer, the island area is electrically connected to the detection point, the welding part is located in the island area in the first direction, and the conductive part is electrically isolated from the detection point. It can determine whether the conductive part and the first body area are welded through according to the electrical connection state between the conductive part and the detection point. When the conductive part and the detection point form a loop, it can be determined that the island area is electrically connected to the first body area and the conductive part, and then it is judged that when the electrode terminal and the conductive part are welded, the laser abnormality causes the conductive part and the first body area to be welded through. When there is an open circuit between the conductive part and the detection point, it can be determined that the island area is electrically isolated from the first body area and the conductive part, and then it is judged that when the electrode terminal and the conductive part are welded, the conductive part and the first body area are not welded through. Therefore, the battery provided by the present application can detect whether the conductive part and the first body area are welded through, thereby reducing the risk of faulty batteries flowing into the client end or even the consumer end. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a battery provided in accordance with an embodiment of the present application.

[0019] Figure 2 Schematic diagram of the layering of the substrate in the battery.

[0020] Figure 3 Schematic diagram of battery welding.

[0021] Figure 4 Schematic diagram of the first test device.

[0022] Figure 5 Schematic diagram of the second test equipment.

[0023] Figure 6 A schematic diagram of a battery provided in accordance with another embodiment of the present application.

[0024] Figure 7 A schematic diagram of a connector testing system provided in one embodiment of the present application.

[0025] Figure 8 A flowchart of a laser weld penetration detection method provided in one embodiment of the present application. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application.

[0027] It is understandable that the connection relationship described in this application refers to direct or indirect connection. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components. For example, A and C can be directly connected, and C and B can be directly connected, so that A and B are connected through C. It is also understandable that the "A connects B" described in this application can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0028] In the description of this application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is only a way to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0029] In the description of this application, words such as "first", "second", etc. are only used to distinguish different objects, and do not limit the quantity and execution order. In addition, the terms "include", "have" and any variations thereof are intended to cover non-exclusive inclusions.

[0030] See also Figure 1 , Figure 1 A schematic diagram of a battery 10 provided in accordance with an embodiment of the present application.

[0031] The battery 10 includes a battery cell 101 and a protection plate 102. The battery cell 101 includes a battery cell body 101c and electrode terminals. The electrode terminals include a first electrode terminal 101a and a second electrode terminal 101b.

[0032] In some embodiments, the first electrode terminal 101 a may be a positive terminal, and the second electrode terminal 101 b may be a negative terminal.

[0033] The first electrode terminal 101 a and the second electrode terminal 101 b are both disposed on one side of the cell body 101 c and extend from the one side of the cell body 101 c .

[0034] The protective plate 102 includes a substrate 102c and a conductive member. The conductive member includes a first conductive member 102a and a second conductive member 102b. The thickness direction of the substrate 102c is a first direction Z. The first direction Z is a direction perpendicular to the paper and inward. The length direction of the substrate 102c is a second direction X. The width direction of the substrate 102c is a third direction Y. The first direction Z, the second direction X, and the third direction Y are perpendicular to each other.

[0035] The substrate 102c is a printed circuit board (PCB), and the first conductive member 102a and the second conductive member 102b are both flat metal members, block metal members or brick metal members. For example, the first conductive member 102a and the second conductive member 102b can both be nickel bricks, nickel blocks, nickel plates, etc.

[0036] The first conductive member 102a and the second conductive member 102b are both disposed on the substrate 102c. A detection point 102f is also disposed on the substrate 102c. The detection point 102f includes a first detection point 102d and a second detection point 102e. Along the second direction X, the first conductive member 102a, the first detection point 102d, the second conductive member 102b, and the second detection point 102e are disposed in pairs. The first detection point 102d is electrically isolated from the first conductive member 102a and the second conductive member 102b, and the second detection point 102e is electrically isolated from the first conductive member 102a and the second conductive member 102b.

[0037] One side of the first conductive member 102a is connected to the substrate 102c and electrically connected. One side of the second conductive member 102b is connected to the substrate 102c and electrically connected. The other side of the first conductive member 102a is welded to the first electrode terminal 101a. The other side of the second conductive member 102b is welded to the second electrode terminal 101b. In this way, the battery cell 101 and the protection plate 102 can be electrically connected by welding.

[0038] In other embodiments, the substrate 102c may also be a flexible printed circuit board (FPCB), a rigid-flexible board, etc. The present application does not impose any limitation on the type of the substrate 102c.

[0039] See also Figure 2 , Figure 2 FIG. 1 is a schematic diagram of the layers of the substrate 102 c in the battery 10 .

[0040] The substrate 102c includes N circuit layers, which are respectively a first circuit layer 1021, a second circuit layer 1022, ..., and an Nth circuit layer 102n.

[0041] Along the first direction Z, the first circuit layer 1021 , the second circuit layer 1022 , . . . , and the Nth circuit layer 102n are stacked in sequence, where N is an integer greater than or equal to 2.

[0042] The first circuit layer 1021 includes a first body region 1021a and a detection point 102f. The first body region 1021a is electrically isolated from the detection point 102f. That is, the first body region 1021a is electrically isolated from the first detection point 102d. The first body region 1021a is electrically isolated from the second detection point 102e. The first body region 1021a is a circuit network (net) region on the first circuit layer 1021.

[0043] One side of the first conductive member 102a is connected to the first body region 1021a and electrically connected, and one side of the second conductive member 102b is connected to the first body region 1021a and electrically connected. Among them, the polarity of the first body region 1021a electrically connected to the first conductive member 102a is the same as the polarity of the first conductive member 102a. The polarity of the first body region 1021a electrically connected to the second conductive member 102b is the same as the polarity of the second conductive member 102b. The polarity of the first conductive member 102a can be determined according to the polarity of the electrode terminal welded thereon. For example, the polarity of the first conductive member 102a can be positive. Similarly, the polarity of the second conductive member 102b can be negative.

[0044] The second circuit layer 1022 includes a second body region 1022a and an island region 1022b. The island region 1022b is electrically isolated from the second body region 1022a. The island region 1022b is electrically connected to the detection point 102f.

[0045] The second body region 1022a is a circuit network region on the second circuit layer 1022. The island region 1022b is an isolated shape, isolated copper, dead copper, etc. region that is not electrically connected to any circuit network region. For example, the island region 1022b is not electrically connected to the first body region 1021a, nor is it electrically connected to the second body region 1022a.

[0046] In some embodiments, the number of isolated island regions 1022b can be set according to the number of conductive members. For example, the conductive members include the first conductive member 102a and the second conductive member 102b, and the isolated island region 1022b can include the first isolated island region 102g and the second isolated island region 102h. The first isolated island region 102g and the second isolated island region 102h can be connected to each other to form an integrated isolated island region 1022b, or can be isolated from each other to form two independent isolated island regions 1022b.

[0047] In some embodiments, the island region 1022b may be electrically connected to the detection point 102f through a via hole. For example, the first island region 102g is electrically connected to the first detection point 102d through a via hole. The second island region 102h is electrically connected to the second detection point 102e through a via hole. The via hole may include a plating through hole (PHT), a blind via hole (BVH), etc. Since the island region 1022b is not electrically connected to any circuit network region, the via hole passing through the island region 1022b and the detection point 102f will not be electrically connected to any circuit network region, for example, the circuit network region of the third circuit layer 1023, the circuit network region of the Nth circuit layer 102n, etc. In this way, the polarity of the island region 1022b is different from the polarity of any circuit network region, and is also different from the polarity of the conductive member electrically connected to any circuit network region.

[0048] The first electrode terminal 101a, the first conductive member 102a, the first body region 1021a and the isolated island region 1022b are stacked along the first direction Z. The second electrode terminal 101b, the second conductive member 102b, the second body region 1022a and the isolated island region 1022b are stacked.

[0049] When viewed along the first direction Z, the overlapping portion of the first electrode terminal 101a and the first conductive member 102a is located in the isolated island region 1022b. The overlapping portion of the second electrode terminal 101b and the second conductive member 102b is located in the isolated island region 1022b.

[0050] See also Figure 3 , Figure 3 Schematic diagram of battery 10 welding.

[0051] When the conductive member and the electrode terminal are welded by laser, taking the welding of the first conductive member 102a and the first electrode terminal 101a as an example, the laser emission direction is the first direction Z, and the laser is irradiated on the overlapping portion of the first conductive member 102a and the first electrode terminal 101a, that is, the portion of the first conductive member 102a and the first electrode terminal 101a that needs to be welded, and the portion that needs to be welded forms a welded portion. The welded portion is the portion of the first conductive member 102a and the first electrode terminal 101a that is melted by laser heating. After cooling and solidification, a tight welded connection is formed between the first conductive member 102a and the first electrode terminal 101a.

[0052] As viewed along the first direction Z, the overlapping portion of the first electrode terminal 101a and the first conductive member 102a, i.e., the welding portion, is located within the island region 1022b. Therefore, if the laser power is abnormal, the first conductive member 102a and the first main body region 1021a may be welded through, causing the first main body region 1021a and the island region 1022b to be connected and short-circuited.

[0053] Since the first body region 1021a is electrically connected to the first conductive member 102a, and the island region 1022b is electrically connected to the first detection point 102d, it is possible to determine whether the first conductive member 102a and the first body region 1021a are welded through by detecting the electrical parameters between the first detection point 102d and the first conductive member 102a.

[0054] Specifically, the power parameters between the first detection point 102d and the first conductive member 102a can be detected by a testing device to determine whether the first conductive member 102a and the first body region 1021a are welded through. The testing device can be a first testing device or a second testing device.

[0055] For example, see Figure 4 , Figure 4 Schematic diagram of a first test device. The first test device is a high voltage tester 11. Here, the power parameter is current.

[0056] The high voltage tester 11 includes a voltage source 111, an ammeter 112, a first end 113 and a second end 114. The two ends of the voltage source 111 are electrically connected to the first end 113 and the ammeter 112, respectively. The ammeter 112 is also electrically connected to the second end 114. The first end 113 is also used to electrically connect the first conductive member 102a. The second end 114 is also used to electrically connect the first detection point 102d. In this way, the two ends of the high voltage tester 11 are electrically connected to the island region 1022b and the first conductive member 102a, respectively. Specifically, the two ends of the high voltage tester 11 are electrically connected to the first island region 102g and the first conductive member 102a, respectively.

[0057] The voltage source 111 outputs a voltage to the first terminal 113. The ammeter 112 is used to detect a current flowing therethrough.

[0058] Since the polarity of the first isolated island region 102g is different from that of the first conductive member 102a, when the first conductive member 102a and the first main body region 1021a are not penetrated by laser welding, the first isolated island region 102g is electrically isolated from the first conductive member 102a. No current flows through the ammeter 112. Therefore, the current displayed by the ammeter 112 should be less than the preset current threshold. When the first conductive member 102a and the first main body region 1021a are penetrated by laser welding, the first isolated island region 102g is connected to the first conductive member 102a. Current flows through the ammeter 112. At this time, the current displayed by the ammeter 112 should be greater than the preset current threshold. In this way, whether the first conductive member 102a and the first main body region 1021a are penetrated by laser welding can be determined by the current value displayed by the ammeter 112 in the high-voltage tester 11.

[0059] In some embodiments, the preset current threshold may be 0.5 mA, the output voltage of the voltage source 111 is 1 kV, the time it takes for the output voltage of the voltage source 111 to rise from 0 to 1 kV is 5 s, and the time it takes to maintain 1 kV is 5 s.

[0060] For another example, see Figure 5 , Figure 5 Schematic diagram of the second test equipment. The second test equipment is an impedance tester 12. Here, the electrical parameter is resistance.

[0061] The impedance tester 12 includes a test resistor R, an ohmmeter 121, a third terminal 122, and a fourth terminal 123. One end of the test resistor R is electrically connected to the third terminal 122 and one end of the ohmmeter 121, and the other end of the test resistor R is electrically connected to the fourth terminal 123 and the other end of the ohmmeter 121. The third terminal 122 is also used to electrically connect the first conductive member 102a. The fourth terminal 123 is also used to electrically connect the first detection point 102d. In this way, the two ends of the impedance tester 12 are electrically connected to the island region 1022b and the first conductive member 102a, respectively. Specifically, the two ends of the impedance tester 12 are electrically connected to the first island region 102g and the first conductive member 102a, respectively.

[0062] The resistance meter 121 is used to detect the resistance at both ends thereof.

[0063] Since the polarity of the island region 1022b is different from that of the conductive member, when the first conductive member 102a and the first body region 1021a are not laser welded through, the first island region 102g is electrically isolated from the first conductive member 102a. The test resistor R is not connected in parallel with other resistors. The resistance value displayed by the resistance meter 121 should be close to the resistance value of the test resistor R. When the first conductive member 102a and the first body region 1021a are laser welded through, the first island region 102g is connected to the first conductive member 102a. At this time, the total resistance at both ends of the resistance meter 121 decreases. At this time, the resistance value displayed by the resistance meter 121 should be less than the preset resistance threshold. In this way, it can be determined whether the first conductive member 102a and the first body region 1021a are laser welded through by the resistance value of the resistance meter 121 in the impedance tester 12.

[0064] In some embodiments, the resistance value of the test resistor R may be 100 kΩ. The preset resistance threshold may be 98 kΩ. For example, when the resistance value displayed by the resistance meter 121 is less than 100 kΩ and greater than 98 kΩ, it indicates that the first conductive member 102a and the first body region 1021a have not been laser welded; when the resistance value displayed by the resistance meter 121 is less than 98 kΩ, it indicates that the first conductive member 102a and the first body region 1021a have been laser welded.

[0065] In summary, the battery 10 provided in the present application can realize welding penetration detection of the conductive member and the first body area 1021a by setting the detection point 102f and electrically connecting the detection point 102f to the island area 1022b of other circuit layers. Therefore, the battery 10 provided in the present application can effectively reduce the risk of battery products with abnormal quality flowing into the client end or even the consumer end.

[0066] In addition, when the conductive member and the first body region 1021a are laser welded through, the first body region 1021a and the island region 1022b are connected. Since the island region 1022b is not electrically connected to any other circuit network region, after the conductive member and the first body region 1021a are laser welded through, the first body region 1021a may not be connected to other circuit network regions, thereby reducing the risk of short circuit between the conductive member and the first body region 1021a after being laser welded through.

[0067] See also Figure 6 , Figure 6 A schematic diagram of a battery 20 provided in accordance with an embodiment of the present application.

[0068] The battery 20 is different from the battery 10 in that the substrate 102c is a flexible printed circuit board (FPC). The battery 20 further includes a connector 21. The substrate 102c further includes a connector pad. The connector 21 is welded on the connector pad. The connector 21 is used to connect to a terminal device. For example, the connector 21 can be welded to a mainboard of the terminal device, thereby connecting to the terminal device.

[0069] In some other embodiments, the battery 20 further includes a connector connecting plate. The connector connecting plate is a flexible printed circuit board (Flexible Printed Circuit Board, FPC). The connector 21 is soldered to the connector connecting plate through the connector pad. When the substrate 102c is a rigid printed circuit board (Printed Circuit Board, PCB), the connector connecting plate is soldered to the rigid printed circuit board.

[0070] The connector 21 includes a first pin, a second pin, a third pin, and a fourth pin.

[0071] Correspondingly, the connector pads include a first pin pad 201 , a second pin pad 202 , a third pin pad 203 and a fourth pin pad 204 .

[0072] The first pin pad 201, the second pin pad 202, the third pin pad 203 and the fourth pin pad 204 are respectively soldered to one end of the first pin, one end of the second pin, one end of the third pin and one end of the fourth pin of the connector 21. The other ends of the first pin, the second pin, the third pin and the fourth pin are all used to connect to the terminal device.

[0073] The first pin pad 201, the second pin pad 202, the third pin pad 203 and the fourth pin pad 204 are all disposed on the first circuit layer 1021. The first pin pad 201 is electrically isolated from the first body region 1021a, the second pin pad 202 and the fourth pin pad 204. The third pin pad 203 is electrically isolated from the first body region 1021a, the second pin pad 202 and the fourth pin pad 204.

[0074] The first pin pad 201 is electrically connected to the first detection point 102d. The third pin pad 203 is electrically connected to the second detection point 102e. The second pin pad 202 is electrically connected to the first conductive element 102a. The fourth pin pad 204 is electrically connected to the second conductive element 102b.

[0075] In this way, since the connector 21 is welded to the connector pad, the connector pad is electrically connected to the conductive member, and the conductive member is welded to the electrode terminal, the battery cell 101 is electrically connected to the terminal device, and the battery cell 101 supplies power to the terminal device.

[0076] In some embodiments, the second pin pad 202 can be electrically connected to the first conductive member 102a through a metal trace or a metal region. For example, copper wire, copper sheet, copper foil, etc. Similarly, the fourth pin pad 204 can also be electrically connected to the second conductive member 102b through a metal trace or a metal region. Here, the metal trace or the metal region can be a part of the first body region 1021a.

[0077] In some embodiments, the first pin pad 201 can be electrically connected to the first detection point 102d through a metal trace or a metal region. Similarly, the third pin pad 203 can also be electrically connected to the second detection point 102e through a metal trace or a metal region. Here, the metal trace or the metal region does not belong to the first body region 1021a.

[0078] In some embodiments, the first detection point 102d is electrically connected to the first isolated island region 102g through a via, a metal trace, and a metal region. Similarly, the second detection point 102e is electrically connected to the second isolated island region 102h through a via, a metal trace, and a metal region. Here, the metal trace and the metal region do not belong to the second body region 1022a, but are part of the first isolated island region 102g and / or the second isolated island region 102h.

[0079] When the conductive member and the electrode terminal are welded by laser, taking the welding of the first conductive member 102a and the first electrode terminal 101a as an example, the electrical parameters between the first pin pad 201 and the second pin pad 202 can be detected by testing equipment to determine whether the first conductive member 102a and the first body area 1021a are welded through.

[0080] Specifically, when the test device is a high voltage tester 11, the two ends of the high voltage tester 11 are respectively connected to the first pin pad 201 and the second pin pad 202, and when the current displayed by the ammeter 112 is greater than the preset current threshold, it is determined that the first conductive member 102a and the first body region 1021a are laser welded through. When the test device is an impedance tester 12, the two ends of the impedance tester 12 are respectively connected to the first pin pad 201 and the second pin pad 202, and when the resistance value displayed by the resistance meter 121 is less than the preset resistance threshold, it is determined that the first conductive member 102a and the first body region 1021a are laser welded through.

[0081] In addition, the connector testing system 30 may be used to detect the electrical parameters between the first pin and the second pin of the connector 21 to determine whether the first conductive member 102a and the first body region 1021a are welded through.

[0082] Specifically, see Figure 7 , Figure 7 A schematic diagram of a connector testing system 30 provided in accordance with an embodiment of the present application.

[0083] The connector test system 30 includes a test board 31 and a connector tester 32. A connector slot is provided on the test board 31. The shape and size of the connector slot are the same as or correspond to the shape and size of the connector 21. The connector slot includes a plurality of pin slots. The number, arrangement, spacing, size and other parameters of the pin slots are the same as or correspond to the number, arrangement, spacing, size and other parameters of the pins of the connector 21. Therefore, the connector 21 can be plugged into the connector slot.

[0084] The pin notch includes a first notch 311 and a second notch 312. The first notch 311 is used to plug in the other end of the first pin of the connector 21, that is, the end that is not soldered to the first pin pad 201.

[0085] The second notch 312 is used to plug the other end of the second pin of the connector 21, that is, the other end that is not soldered to the second pin pad 202. The first notch 311 and the second notch 312 are both electrically connected to the connector tester 32. Therefore, the connector tester 32 can detect the power parameters between the first notch 311 and the second notch 312 to determine whether there is a short circuit between the first pin and the second pin of the connector 21. Since the first pin and the second pin of the connector 21 are electrically connected to the first detection point 102d and the first conductive member 102a, respectively, the connector tester 32 can determine whether the first conductive member 102a and the first body region 1021a are soldered through by detecting the power parameters between the first notch 311 and the second notch 312.

[0086] In some embodiments, the connector tester 32 may be a high voltage tester 11 or an impedance tester 12. The detection principle and detection method of the high voltage tester 11 or the impedance tester 12 may refer to the relevant description above and will not be repeated here.

[0087] See also Figure 8 An embodiment of the present application provides a laser welding penetration detection method. The laser welding penetration detection method is applied to the battery 10 and the battery 20. The laser welding penetration detection method can be performed by a testing device, such as a high voltage tester 11, an impedance tester 12, a connector tester 32, etc. The laser welding penetration detection method includes the following steps.

[0088] Step S81, obtaining the power parameters between the conductive member and the detection point 102f.

[0089] The electrical parameter may be current or resistance.

[0090] Step S82, determining whether the power parameters meet the preset conditions.

[0091] For example, when the power parameter is current, the power parameter meeting the preset condition includes: the current between the conductive member and the detection point 102f is greater than a preset current threshold.

[0092] For another example, when the power parameter is resistance, the power parameter meeting the preset condition includes: the resistance between the conductive element and the detection point 102f is less than a preset resistance threshold.

[0093] When the power parameter meets the preset condition, it can be determined that the conductive member and the first body region 1021 a are welded through.

[0094] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of protection claimed in the present application.

Claims

1. A battery, comprising a battery cell and a protection board, wherein the battery cell comprises a battery cell body and an electrode terminal, characterized in that: The protection plate comprises: A substrate, the substrate comprising a first circuit layer and a second circuit layer stacked along a first direction, the first direction being a thickness direction of the substrate, the first circuit layer comprising a first body region and a detection point, the first body region being electrically isolated from the detection point, the second circuit layer comprising an island region, the island region being electrically connected to the detection point; A conductive member, along the first direction, the electrode terminal, the conductive member, the first main body region and the island region are stacked, one side of the conductive member is connected to the first main body region and electrically connected, the other side of the conductive member is welded to the electrode terminal and electrically connected, along the first direction, the area where the conductive member and the electrode terminal are overlapped and welded forms a welding portion, and when observed along the first direction, the welding portion is located in the island region.

2. The battery according to claim 1, characterized in that The second circuit layer further includes a second body region, the island region is electrically isolated from the second body region, and the first body region is electrically isolated from the second body region.

3. The battery according to claim 1, characterized in that The isolated island area is electrically connected to the detection point through a via hole.

4. The battery according to claim 3, characterized in that The via hole includes a blind hole from the detection point to the island area.

5. The battery according to claim 1, characterized in that The battery also includes a connector, the substrate includes a connector pad, the connector includes a first pin, the connector pad includes a first pin pad, the first pin is welded to the first pin pad, the first pin pad is electrically isolated from the first body area, and the first pin pad is electrically connected to the detection point.

6. The battery according to claim 5, characterized in that The connector further includes a second pin, and the connector pad further includes a second pin pad, the second pin pad is welded to the second pin, the second pin is electrically isolated from the first pin, and the second pin pad is electrically connected to the conductive member.

7. The battery according to claim 1, characterized in that The conductive member is a flat metal member.

8. The battery according to claim 7, characterized in that The polarity of the conductive member is different from the polarity of the isolated island region.

9. A terminal device, characterized in that: Comprising the battery as claimed in any one of claims 1 to 8.

10. A laser welding penetration detection method, characterized in that: The detection method is applied to any battery as claimed in claims 1 to 8, and the detection method comprises: Acquiring electrical parameters between the conductive member and the detection point; If the power parameter meets a preset condition, it is determined that the conductive element and the first body region are welded through by the laser.

11. The laser welding penetration detection method according to claim 10, characterized in that: The power parameter includes current, and the power parameter meets a preset condition, including that the current between the conductive member and the detection point is greater than a preset current threshold.

12. The laser welding penetration detection method according to claim 10, characterized in that: The electrical parameter includes resistance, and the electrical parameter meets a preset condition, including that the resistance between the conductive member and the detection point is less than a preset resistance threshold.

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