Battery and battery protection board

Abstract

The embodiment of the invention provides a battery and a battery protection plate. The battery comprises a battery cell and a battery protection plate, the battery protection plate comprises a rigid first part and a flexible second part; the first part is connected with the battery cell and is used for protecting and controlling the battery cell; the first connecting end of the second part is connected with the first part so as to be used for signal transmission between the first part and an external system; wherein the edge of the second part is provided with a sensing structure; the sensing structure is suitable for being attached to the surface of the battery cell so as to obtain sensing data representing the temperature of the battery cell, and the sensing data are transmitted to the first part through the first connecting end.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to but not limited to a battery and a battery protection board. Background Art

[0002] Since the temperature change of the battery has a significant impact on its capacity, charging and discharging efficiency, life and safety, when using the battery, both hardware heat dissipation and software current limiting need to consider the heat dissipation performance of the battery to improve the charging and discharging performance and safety of the battery.

[0003] In the related art, a battery protection board is provided at one end of the battery, and the temperature of the battery is measured in real time through the NTC thermistor on the battery protection board to protect and control the temperature of the battery. Since the NTC thermistor is welded to the battery protection board through leads, this connection method requires manual or semi-automatic welding to fix it to the battery protection board. Furthermore, due to the irregularity of the leads, the operator has to perform the wire-winding action when fixing the NTC thermistor to the battery cell in the later stage by glue, which not only makes the process complicated, but also makes the NTC thermistor and the battery protection board easily disconnected, requiring rework for connection, thereby reducing the battery yield. Summary of the invention

[0004] In view of this, an embodiment of the present disclosure provides a battery and a battery protection board.

[0005] In a first aspect, an embodiment of the present disclosure provides a battery, comprising:

[0006] Battery cells;

[0007] A battery protection plate, comprising a rigid first part and a flexible second part;

[0008] The first part is connected to the battery cell for protection control of the battery cell; the first connection end of the second part is connected to the first part for signal transmission between the first part and an external system;

[0009] Wherein, a sensing structure is provided at the edge of the second portion;

[0010] The sensing structure is suitable for being attached to the surface of the battery cell to obtain sensing data representing the temperature of the battery cell, and transmit the sensing data to the first part through the first connection end.

[0011] In some embodiments, the sensing structure is a bent structure, so as to be suitable for being attached to the surface of the battery cell and being signal-conducted with the first connection end.

[0012] In some embodiments, the sensing structure is a bent structure, extending outward from an edge of the first connection end and being signal-conducted with the first connection end.

[0013] In some embodiments, the bending structure extends outward from the edge of the first connecting end and includes, in sequence: a supporting portion and a mounting portion;

[0014] The mounting portion is mounted with a sensing element, and the sensing element is used to obtain the sensing data;

[0015] The support portion includes a first transmission line for communication between the sensing element and the first portion.

[0016] In some embodiments, the first connection end includes: a first pad and a second pad;

[0017] The first portion and the second portion are welded via the first welding pad and the second welding pad;

[0018] wherein the sensing element is communicatively coupled to the first portion via the first transmission line and the first pad;

[0019] The second portion includes a second transmission line, which is communicatively coupled to the first portion through the second pad for signal transmission between the first portion and the external system.

[0020] In some embodiments, the sensing structure and the second portion are an integrally formed structure.

[0021] In some embodiments, a first surface of the sensing element is mounted on the mounting portion, and a second surface of the sensing element opposite to the first surface is attached to the surface of the battery core through a thermally conductive adhesive.

[0022] In a second aspect, an embodiment of the present disclosure provides a battery protection plate, comprising: a rigid first part and a flexible second part,

[0023] The first part is used to connect with the battery cell to control the protection of the battery cell; the first connection end of the second part is connected to the first part to be used for signal transmission between the first part and an external system;

[0024] Wherein, a sensing structure is provided at the edge of the second portion;

[0025] When the first part is in a connected state with the battery cell, the sensing structure is suitable for being attached to the surface of the battery cell to obtain sensing data representing the temperature of the battery cell and transmit the sensing data to the first part through the first connecting end.

[0026] In some embodiments, the sensing structure is a bent structure, so as to be suitable for being attached to the surface of the battery cell and being signal-conducted with the first connection end.

[0027] In some embodiments, the sensing structure is a bent structure, extending outward from an edge of the first connection end and being signal-conducted with the first connection end.

[0028] The disclosed embodiment provides a battery and a battery protection board; wherein the battery comprises: a battery cell and a battery protection board; the battery protection board comprises a rigid first part and a flexible second part; the first part is connected to the battery cell for protection and control of the battery cell; the first connection end of the second part is connected to the first part for signal transmission between the first part and an external system; wherein a sensing structure is provided at the edge of the second part; the sensing structure is suitable for being attached to the surface of the battery cell to obtain sensing data representing the temperature of the battery cell, and transmits the sensing data to the first part through the first connection end. Here, since the sensing structure is provided at the edge of the flexible second part, the sensing structure can serve as an extension area of ​​the second part, and the sensing structure and the second part can be integrally formed, thereby ensuring the tightness of the connection of the sensing structure and improving the yield rate of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In the accompanying drawings (which are not necessarily drawn to scale), like reference numerals may describe similar components in different views. Like reference numerals with different letter suffixes may represent different examples of similar components. The accompanying drawings generally illustrate various embodiments discussed herein by way of example and not limitation.

[0030] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present disclosure;

[0031] Figure 2 A schematic diagram of the structure of the second part and the sensing structure provided in the embodiment of the present disclosure Figure 1 ;

[0032] Figure 3 A schematic diagram of the structure of the second part and the sensing structure provided in the embodiment of the present disclosure Figure 2 ;

[0033] Figure 4 A schematic diagram of the structure of the second part and the sensing structure provided in the embodiment of the present disclosure Figure 3 ;

[0034] Figure 5 A schematic diagram of the structure of the second part and the sensing structure provided in the embodiment of the present disclosure Figure 4 ;

[0035] Figure 6 A schematic diagram of the structure of a battery protection board provided in an embodiment of the present disclosure;

[0036] Figure 7 A schematic diagram of the results of a battery temperature test provided by an embodiment of the present disclosure;

[0037] Figure 8 Schematic diagram of the battery preparation process provided in the embodiment of the present disclosure Figure 1 ;

[0038] Fig. 9 Schematic diagram of the battery preparation process provided in the embodiment of the present disclosure Figure 2 ;

[0039] Fig.10 Schematic diagram of the battery preparation process provided in the embodiment of the present disclosure Figure 3 ;

[0040] Fig.11 A schematic diagram of the circuit structure of a battery protection board provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0041] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the specific embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0042] In the following description, a large number of details are given to provide a more thorough understanding of the present disclosure. However, it is obvious to those skilled in the art that the present disclosure can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present disclosure, some technical features known in the art are not described; that is, all features of actual embodiments are not described here, and well-known functions and structures are not described in detail.

[0043] In the drawings, the sizes of layers, regions, elements and their relative sizes may be exaggerated for clarity. Like reference numerals denote like elements throughout.

[0044] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there is no intervening element or layer. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present disclosure, the first element, component, region, layer or part discussed below can be represented as the second element, component, region, layer or part. And when the second element, component, region, layer or part is discussed, it does not indicate that the present disclosure necessarily has the first element, component, region, layer or part.

[0045] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be a limitation of the present disclosure. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0046] At present, the temperature of the battery cells in the battery can be monitored by using NTC thermistors (Negative Temperature Coefficient Thermistor). In the related technology, first, the leads of the NTC thermistor and the printed circuit board (PCB) are welded together; next, the PCB board and the flexible printed circuit (FPC) board are welded, wherein the NTC thermistor, PCB board and FPC board together constitute the battery protection board; finally, the technicians straighten the NTC thermistor to ensure the accuracy of the NTC thermistor attachment position, and at the same time, attach the NTC thermistor to the surface of the battery cell through thermal conductive glue. In this way, the NTC thermistor can transmit the temperature of the battery cell to the PCB board in real time; the external system can read the temperature data in the PCB board through the FPC board to achieve temperature control of the battery cell.

[0047] However, the related art has the following disadvantages: (1) The NTC thermistor is fixed to the PCB board by technicians or semi-automatic welding. This connection method makes it easy for the NTC thermistor and the PCB board to disconnect, resulting in a defective rate of about 2% for the battery, which requires rework and connection. (2) Since the leads of the NTC thermistor are irregular, in the process of fixing the NTC thermistor to the battery cell with thermal conductive glue, technicians need to perform actions such as wire drawing to avoid the detection point on the NTC thermistor from being offset or protruding, which results in low battery process efficiency and yield. (3) Leaded NTC thermistors are semi-finished components that require customized processing, which makes the cost higher.

[0048] Based on this, the present disclosure provides a battery 100. Figure 1 A schematic diagram of the structure of a battery 100 provided in an embodiment of the present disclosure is shown in FIG. Figure 1 As shown, the battery 100 includes: a battery cell 110 and a battery protection board 120 .

[0049] Here, the battery cell 110 is used to store and release electrical energy. The battery protection board 120 is used to monitor and protect the battery cell 110; for example, the battery protection board 120 can prevent the charging voltage of the battery cell 110 from exceeding the maximum safety value, and avoid the expansion and thermal runaway of the battery cell 110; for another example, the battery protection board 120 can monitor the temperature of the battery cell 110 to prevent the battery cell 110 from overheating, and stop the charging and discharging operation of the battery cell 110 when necessary.

[0050] Please continue to refer to Figure 1 The battery protection board 120 includes a rigid first part 121 and a flexible second part 122; the first part 121 is connected to the battery cell 110 for protection control of the battery cell 110; the first connection end A of the second part 122 is connected to the first part 121 for signal transmission between the first part 121 and an external system.

[0051] In the embodiment of the present disclosure, the first part 121 may be a PCB board, and the second part 122 may be an FPC board; the circuits and electronic components on the first part 121 and the second part 122 together constitute the protection circuit in the battery protection board 120. Furthermore, the first part 121 is provided with B+ and B- terminals (the positions can be referred to in Fig.10 ), the first part 121 is connected to the positive electrode and negative electrode of the battery cell 110 through the B+ and B- terminals respectively, and the chip in the first part 121 is used to protect and control the battery cell 110 (such as cutting off the charge and discharge circuit, slowing down the charging speed, etc.). The surface of the second connection end B is mounted with a connector 122a, and the second part 122 is connected to an external system through the connector 122a on the surface of the second connection end B. The external system can be, for example, a battery management system (Battery Management System, BMS).

[0052] Please continue to refer to Figure 1 A sensing structure 123 is provided at the edge of the second part 122; the sensing structure 123 is suitable for being attached to the surface of the battery cell 110 to obtain sensing data representing the temperature of the battery cell 110, and transmit the sensing data to the first part 121 through the first connection terminal A.

[0053] In the disclosed embodiment, since the sensing structure 123 is disposed at the edge of the second portion 122 , it is convenient to attach the sensing structure 123 to the battery cell 110 ; in addition, the sensing structure 123 is in contact with the surface of the battery cell 110 , and sensing data can be acquired in real time.

[0054] In the disclosed embodiment, since the sensing structure is disposed at the edge of the flexible second part, the sensing structure can serve as an extension area of ​​the second part, and the sensing structure and the second part can be integrally formed, thereby ensuring the tightness of the connection of the sensing structure and improving the yield rate of the battery.

[0055] Next, please refer to Figures 2 to 5 , the structures of the second part 122 and the sensing structure 123 are introduced in detail.

[0056] In some embodiments, please refer to Figures 2 to 5 The sensing structure 123 is a bent structure suitable for being attached to the surface of the battery cell 110 and being connected to the first connection terminal A for signal conduction.

[0057] In the embodiment of the present disclosure, the sensing structure 123 may be any suitable bending structure. For example, the bending structure may be Figure 2 , Figure 4 and Figure 5 As shown in the L-shape; for example, the bending structure can be Figure 3 In this way, a bending structure matching the battery cell 110 can be selected according to actual conditions, so that the sensing structure 123 and the battery cell 110 are in closer contact, which not only improves the accuracy of sensing, but also helps to reduce errors caused by gaps or misalignments.

[0058] In the embodiment of the present disclosure, the sensing structure 123 can be disposed at any suitable position on the edge of the second portion 122; for example, the sensing structure 123 can be disposed in the middle of the edge of the second portion 122 (eg Figure 2 As shown), right side (as shown Figure 3 as shown) or on the left (as shown Figure 4 and Figure 5). The signal conduction between the sensing structure 123 and the first connection terminal A means that when the sensing structure 123 is arranged at any position on the edge of the second portion 122, it can be connected to the first connection terminal A through the circuit in the second portion 122. In this way, the layout of the sensing structure 123 is more flexible.

[0059] For further information, please refer to Figures 2 to 5 The sensing structure 123 extends outward from the edge of the second portion 122 and includes: a support portion 123a and a mounting portion 123b. The support portion 123a can extend outward from any area of ​​the edge of the second portion 122; for example, the sensing structure 123 extends outward from the middle of the edge of the second portion 122 (such as Figure 2 As shown), right side (as shown Figure 3 as shown) or on the left (as shown Figure 4 and Figure 5 shown) extending outward.

[0060] It should be noted that the mounting portion 123b may be in a straight line shape (eg Figures 2 to 5 As shown), it is convenient to mount the sensing element on the surface of the mounting portion 123b; in other embodiments, the mounting portion 123b may also be other suitable shapes; the extended length of the support portion 123a may be any suitable length.

[0061] In some embodiments, please refer to Figure 4 and Figure 5 The sensing structure 123 is a bent structure, extending outward from the edge of the first connection end A and being connected to the first connection end A for signal conduction.

[0062] In the embodiment of the present disclosure, since the sensing structure 123 is connected to the edge of the first connection terminal A, the connection circuit between the sensing structure 123 and the first connection terminal A is reduced, thereby reducing interference and loss of sensing data during transmission, thereby improving the accuracy and reliability of the sensing data.

[0063] In some embodiments, please refer to Figures 2 to 5 , the sensing structure 123 and the second part 122 are an integrally formed structure.

[0064] Specifically, an extension area is designed at the edge of the second portion 122, and the extension area is the support portion 123a and the mounting portion 123b in the sensing structure 123, so that the circuits in the sensing structure 123 and the second portion 122 can be formed at the same time, which helps to improve the process efficiency and yield rate of the battery 100. In addition, since the second portion 122 is flexible, the sensing structure 123 (i.e., the support portion 123a and the mounting portion 123b) is also flexible, which is conducive to the bonding of the sensing structure 123 and the battery cell 110.

[0065] Next, please refer to Figure 6 , the battery protection board 120 in the embodiment of the present disclosure is described in detail. Among them, Figure 6 Shows Figure 5 The second part and the sensing structure, Figure 6 Schematic diagram of the structure of the front and back sides of the battery protection board 120.

[0066] In some embodiments, please refer to Figure 6 The sensing structure 123 (i.e., the bending structure) extends outward from the edge of the first connection end A, and includes: a supporting portion 123a and a mounting portion 123b. The mounting portion 123b is mounted with a sensing element 123c, and the sensing element 123c is used to obtain sensing data; the supporting portion 123a includes a first transmission line 1231a, and the first transmission line 1231a is used for communication between the sensing element and the first portion 121.

[0067] Here, the number of sensing elements 123c can be set according to actual needs; for example, the number of sensing elements 123c can be set to 1; for another example, the number of sensing elements 123c can be set to 2, so that one of the sensing elements 123c can be used as a backup, reducing the damage rate of the battery protection board.

[0068] In the embodiment of the present disclosure, the sensing element 123c may be an NTC thermistor, and the sensing data may be a resistance value. Since the resistance value of the NTC thermistor decreases as the temperature increases, the temperature of the battery cell 110 may be detected according to the resistance value of the NTC thermistor. In other embodiments, the sensing element 123c may also be other elements that can detect temperature, and the present disclosure is not limited to this.

[0069] In the embodiment of the present disclosure, since the sensing structure 123 and the second part 122 are an integrally formed structure, the first transmission line 1231a and the second transmission line in the second part 122 can be formed at the same time, and there is no need to additionally set up the leads of the sensing element 123c, which helps to improve the process efficiency and yield of the battery 100.

[0070] In addition, the sensing structure 123 and the second part 122 are an integrally formed structure, and the sensing element 123c on the sensing structure 123 and the connector 122a on the second connection end B can be mounted in the same process step, thereby reducing the process steps.

[0071] In some embodiments, please refer to Figure 6The first connection end A includes: a first pad 124 and a second pad 125; the first part 121 and the second part 122 are welded through the first pad 124 and the second pad 125; wherein the sensing element 123c is communicatively coupled to the first part 121 through the first transmission line 1231a and the first pad 124; the second part 122 includes a second transmission line (not shown), and the second transmission line is communicatively coupled to the first part 121 through the second pad 125 for signal transmission between the first part 121 and an external system.

[0072] That is, the sensing element 123c and the first part 121 perform signal transmission through the first pad 124; the first part 121 and the second part 122 perform signal transmission through the second pad 125. Specifically, the sensing element 123c can sequentially transmit the acquired sensing data to the first part 121 through the first transmission line 1231a and the first pad 124; the first part 121 processes the acquired sensing data, and transmits the processed sensing data to the external system through the second pad 125 and the second transmission line in the second part 122.

[0073] Furthermore, when the temperature of the battery cell 110 exceeds a preset safety range, the external system can instruct the battery protection board 120 to take safety measures to protect the battery cell 110 (such as cutting off the charging and discharging circuit, slowing down the charging speed, etc.) to prevent the battery cell 110 from being damaged or causing a safety accident.

[0074] In this disclosure, please continue to refer to Figure 6 The first pad 124 and the second pad 125 each include a plurality of solder joints, wherein when the sensing element 123c is an NTC thermistor, two ends of the NTC thermistor are respectively connected to two solder joints of the first pad 124 through the first transmission line 1231a.

[0075] In some embodiments, the first surface of the sensing element 123c is mounted on the mounting portion 123b, and the second surface of the sensing element 123c opposite to the first surface is connected to the mounting portion 123b by a thermal conductive adhesive 130 (see the position for details). Figure 1 ) is attached to the surface of the battery cell 110.

[0076] In the embodiment of the present disclosure, since the sensing element 123c is directly mounted on the surface of the mounting portion 123b, complicated connection and fixing steps are avoided. Compared with the sensing element in the prior art (such as a lead-type NTC thermistor), the present disclosure does not need to customize the sensing element 123c, thereby simplifying the production process and reducing the production cost. In addition, the sensing element 123c is attached to the surface of the battery cell 110 through the thermal conductive adhesive 130. On the one hand, the temperature of the battery cell 110 can be transmitted through the thermal conductive adhesive 130. On the other hand, the sensing element 123c can be attached more firmly, thereby improving the accuracy of the detection.

[0077] The embodiment of the present disclosure also tests the battery 100 to determine the reliability of the battery provided by the present disclosure.

[0078] First, the battery was drop tested. After the drop test, the voltage and internal resistance of the battery met the evaluation criteria. For example, after the battery was drop tested, the voltage of the first battery before the test was 3.781V, and the voltage after the test was 3.781V. The percentage of voltage before and after the test did not change. The internal resistance of the first battery before the test was 48.7mΩ, and the internal resistance after the test was 48.6mΩ. The percentage change of internal resistance before and after the test was -0.21%, which met the evaluation criteria. In addition, the appearance of the battery after the drop test was good, without deformation, tearing, etc. At the same time, the battery cell and the battery protection board were well connected, without falling off or cracking.

[0079] Secondly, perform temperature test on the battery, such as Figure 7 As shown, the temperature read by the battery protection board 120 is slightly different from the actual ambient temperature; the difference between the actual surface temperature of the battery cell 110 and the temperature read by the battery protection board 120 is within 1.5°C, which meets the usage standard of the battery specification (the difference in the battery specification is ±3°C).

[0080] In summary, the battery 100 provided by the embodiment of the present disclosure has relatively strong connections between the battery cell 110 and the battery protection board 120, and between the first part 121, the second part 122 and the sensing structure 123 in the battery protection board 120, so that the yield rate of the battery 100 is relatively high. In addition, the second part 122 and the sensing structure 123 are an integrated structure, which reduces the loss of the sensing structure 122 when transmitting sensing data, so that the measurement result is more accurate.

[0081] In addition, the present disclosure provides a battery protection board 120, please refer to Figure 6 It includes a rigid first part 121 and a flexible second part 122, the first part 121 is used to connect with the battery cell 110 to control the protection of the battery cell 110; the first connecting end of the second part 122 is connected to the first part 121 for signal transmission between the first part 121 and an external system; wherein a sensing structure 123 is provided at the edge of the second part 122; when the first part 121 and the battery cell 110 are in a connected state, the sensing structure 123 is suitable for being attached to the surface of the battery cell 110 to obtain sensing data characterizing the temperature of the battery cell 110, and transmit it to the first part 121 through the first connecting end.

[0082] In the embodiment of the present disclosure, the structures of the second portion 122 and the sensing structure 123 can refer to Figures 2 to 5Specifically, the sensing structure 123 can be disposed at any suitable position on the edge of the second portion 122; for example, the sensing structure 123 can be disposed in the middle of the edge of the second portion 122 (eg, Figure 2 As shown), right side (as shown Figure 3 as shown) or on the left (as shown Figure 4 and Figure 5 shown).

[0083] In some embodiments, the sensing structure 123 is a bent structure suitable for being attached to the surface of the battery cell 110 and being connected to the first connection terminal for signal conduction. Figure 2 , Figure 3 and Figure 5 As shown in the L-shape; for example, the bending structure can be Figure 3 The U-shape shown.

[0084] In some embodiments, please refer to Figure 6 The sensing structure 123 is a bent structure, extending outward from the edge of the first connection end and being signal-conducted with the first connection end.

[0085] In some embodiments, please refer to Figure 6 The bending structure (i.e., the sensing structure 123) extends outward from the edge of the first connection end A, and includes in sequence: a supporting portion 123a and a mounting portion 123b; the mounting portion 123b is mounted with a sensing element 123c, and the sensing element 123c is used to obtain sensing data; the supporting portion 123a includes a first transmission line 1231a, and the first transmission line 1231a is used for communication between the sensing element and the first portion 121.

[0086] In some embodiments, please refer to Figure 6 The first connection end A includes: a first pad 124 and a second pad 125; the first part 121 and the second part 122 are welded through the first pad 124 and the second pad 125; wherein the sensing element 123c is communicatively coupled to the first part 121 through the first transmission line 1231a and the first pad 124; the second part 122 includes a second transmission line (not shown), and the second transmission line is communicatively coupled to the first part 121 through the second pad 125 for signal transmission between the first part 121 and an external system.

[0087] In some embodiments, the sensing structure 123 and the second part 122 are integrally formed. That is, an extension area is designed at the edge of the second part 122, and the extension area is the sensing structure 123; thus, the first transmission line 1231a and the second transmission line can be formed at the same time, and there is no need to set up additional leads for the sensing element 123c, which helps to improve the process efficiency and yield rate of the battery 100. In addition, the sensing element 123c on the sensing structure 123 and the connector 122a on the second connection end B can be mounted simultaneously, reducing the process steps.

[0088] In some embodiments, please refer to Figure 6 , a first surface of the sensing element 123c is mounted on the mounting portion 123b.

[0089] In the disclosed embodiment, since the sensing structure is disposed at the edge of the flexible second part, the sensing structure can serve as an extension area of ​​the second part, and the sensing structure and the second part can be integrally formed, thereby ensuring the tightness of the connection of the sensing structure and improving the yield rate of the battery.

[0090] The battery protection board 120 provided in the embodiment of the present disclosure is similar to the battery protection board 120 in the above-mentioned embodiment. For the technical features not fully disclosed in the embodiment of the present disclosure, please refer to the above-mentioned embodiment for understanding, and no further details will be given here.

[0091] The present disclosure also provides a method for preparing a battery 100, wherein the battery 100 is formed as follows: Figure 1 The battery 100 shown, the preparation method of the battery 100 includes: step 1 to step 3.

[0092] First, please refer to Figure 8 , perform step 1, provide a rigid first part 121 and a flexible second part 122, wherein a sensing structure 123 is provided at an edge of the second part 122.

[0093] In the embodiment of the present disclosure, the first part 121 may be a PCB board, and the second part 122 may be an FPC board. The first connection end A of the second part 122 includes: a first solder pad 124 and a second solder pad 125, the second connection end B of the second part 122 is mounted with a connector, the second part 122 includes a second transmission line (not shown), the second transmission line connects the connector and the second solder pad 125; the sensing structure 123 extends outward from the edge of the second part 122, and includes in sequence: a support portion 123a and a mounting portion 123b, the mounting portion 123b is mounted with a sensing element 123c, the support portion 123a includes a first transmission line 1231a, and the first transmission line 1231a connects the sensing element 123c and the first solder pad 124.

[0094] It should be noted that in the embodiment of the present disclosure, the sensing element 123c and the connector 122a can be mounted simultaneously, thereby optimizing the process flow.

[0095] Next, please refer to Fig. 9 , perform step 2 to weld one end of the first part 121 and the first connecting end A of the second part 122 to form the battery protection board 120.

[0096] In the embodiment of the present disclosure, the first part 121 and the second part 122 are welded through the first pad 124 and the second pad 125; the sensing element 123c can be communicatively coupled to the first part 121 through the first transmission line 1231a and the first pad 124; the second transmission line in the second part 122 can be communicatively coupled to the first part 121 through the second pad 125, so as to be used for signal transmission between the first part 121 and an external system.

[0097] In the embodiment of the present disclosure, since the sensing structure 123 is arranged at the edge of the second part 122 and is connected to the first pad in the first connection end A through the first transmission line 1231a, the sensing structure 123 can be welded to the first part 121 at the same time as the first part 121 and the second part 122 are welded, thereby reducing the process flow.

[0098] Finally, please refer to Fig.10 and Figure 1 , perform step three, provide a battery cell 110, and attach the sensing structure 123 in the battery protection plate 120 to the surface of the battery cell 110 through a thermal conductive adhesive.

[0099] In the present disclosure, first, please refer to Fig.10 , the B+ terminal in the first part 121 is connected to the positive electrode of the battery cell 110 through a battery cell tab 111, and the B- terminal is connected to the negative electrode of the battery cell 110 through another battery cell tab 111; Next, please refer to Figure 1 , the second surface of the sensing element 123 c on the surface of the sensing structure 123 is attached to the surface of the battery cell 110 through the thermal conductive adhesive 130 .

[0100] In the embodiment of the present disclosure, since the sensing structure 123 and the second part 122 are an integrated structure, compared with the prior art, actions such as wire drawing are avoided, and the thermal conductive adhesive 130 can be directly applied and fixed, which simplifies the difficulty of the process.

[0101] like Fig.11As shown, it is a schematic diagram of the circuit structure of the battery protection board in the embodiment of the present disclosure; wherein, the first part 121 is provided with a control chip 21, a first MOS tube switch 22, a second MOS tube switch 23, a first protection chip 24, a second protection chip 25 and a sampling resistor 26, and the positive and negative electrodes of the battery cell are connected to the first part 121 in the battery protection board through the B+ and B- terminals.

[0102] The first protection chip 24 is used to control the switch state of the first MOS transistor switch 22, and the second protection chip 25 is used to control the switch state of the second MOS transistor switch 23; when the voltage or current on the sampling resistor 26 exceeds the safety range, the first protection chip 24 and the second protection chip instruct the corresponding MOS transistor switch to be disconnected, and when the voltage or current on the sampling resistor 26 returns to the safety range, the first protection chip 24 and the second protection chip instruct the corresponding MOS transistor switch to be turned on. By setting two sets of protection chips and MOS transistor switches, the battery can be made safer.

[0103] Please continue to refer to Fig.11 The control chip 21 is used to collect and process data information; for example, the control chip 21 is connected to the sampling resistor 26, and the remaining power of the battery cell is calculated by the current of the sampling resistor 26; for another example, the control chip 21 is connected to the sensing structure 123 to obtain sensing data (such as resistance value), and after the control chip 21 processes the sensing data, the processed sensing data is transmitted to the external system through the second part 122.

[0104] In the several embodiments provided in the present disclosure, it should be understood that the disclosed structures and methods can be implemented in a non-targeted manner. The structural embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the components shown or discussed are coupled or directly coupled to each other.

[0105] The features disclosed in several method or structural embodiments provided in the present disclosure may be arbitrarily combined without conflict to obtain new method embodiments or structural embodiments.

[0106] The above are only some embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A battery comprising: Battery cells; A battery protection plate, comprising a rigid first part and a flexible second part; The first part is connected to the battery cell for protection control of the battery cell; the first connection end of the second part is connected to the first part for signal transmission between the first part and an external system; Wherein, a sensing structure is provided at the edge of the second portion; The sensing structure is suitable for being attached to the surface of the battery cell to obtain sensing data representing the temperature of the battery cell, and transmit the sensing data to the first part through the first connection end.

2. The battery according to claim 1, The sensing structure is a bent structure, suitable for being attached to the surface of the battery cell and being connected to the first connection end for signal conduction. 3 . The battery according to claim 1 , wherein the sensing structure is a bent structure, extending outward from an edge of the first connection end and being signal-conducted with the first connection end.

4. The battery according to claim 3, wherein the bent structure extends outward from an edge of the first connecting end and comprises: Support and mounting parts; The mounting portion is mounted with a sensing element, and the sensing element is used to obtain the sensing data; The support portion includes a first transmission line for communication between the sensing element and the first portion.

5. The battery according to claim 4, wherein the first connection terminal comprises: a first pad and a second pad; The first portion and the second portion are welded via the first welding pad and the second welding pad; wherein the sensing element is communicatively coupled to the first portion via the first transmission line and the first pad; The second portion includes a second transmission line, which is communicatively coupled to the first portion through the second pad for signal transmission between the first portion and the external system. The battery according to claim 1 , wherein the sensing structure and the second portion are an integrally formed structure. 7 . The battery according to claim 4 , wherein a first surface of the sensing element is mounted on the mounting portion, and a second surface of the sensing element opposite to the first surface is attached to a surface of the battery cell through a thermally conductive adhesive.

8. A battery protection plate, comprising a rigid first part and a flexible second part, The first part is used to connect with the battery cell to control the protection of the battery cell; the first connection end of the second part is connected to the first part to be used for signal transmission between the first part and an external system; in, A sensing structure is disposed at an edge of the second portion; When the first part is in a connected state with the battery cell, the sensing structure is suitable for being attached to the surface of the battery cell to obtain sensing data representing the temperature of the battery cell and transmit the sensing data to the first part through the first connecting end. 9 . The battery protection board according to claim 8 , wherein the sensing structure is a bent structure, so as to be suitable for being attached to the surface of the battery cell and being signal-conducted with the first connection end. 10 . The battery protection board according to claim 8 , wherein the sensing structure is a bent structure, extending outward from an edge of the first connection end and being signal-conducted with the first connection end.

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