Battery cell temperature collecting assembly and battery pack

Abstract

The utility model relates to a battery cell temperature collecting assembly and a battery pack, and relates to the technical field of battery packs. The battery cell temperature collecting assembly comprises a temperature measuring module and a bonding piece. The temperature measuring module is attached to a shell of a battery cell and used for detecting the temperature of the battery cell. The bonding piece is partially connected to one side, deviating from the shell, of the temperature measuring module, and the bonding piece is bonded with the battery cell and maintains the temperature measuring module and the shell in an attached state. The battery cell is provided with a mounting structure and / or a chip protruding out of the shell, the mounting structure and / or the chip can be matched with the shell to form a mounting groove, and the temperature measuring module is located in the mounting groove. The battery cell temperature collecting assembly can solve the problem that in the prior art, a plastic support needs to be independently arranged on a temperature collecting assembly, and consequently the production cost is high.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular, to a battery cell temperature collection component and a battery pack. Background Art

[0002] During the use of power batteries, a temperature sensing component needs to be set up to monitor the battery temperature. When the temperature sensing component is installed in the power battery, on the one hand, it is necessary to ensure that the negative temperature coefficient (NTC) thermistor in the temperature sensing component is tightly fitted with the battery cell shell below, and on the other hand, a support structure needs to be set up on the top of the temperature sensing component to protect it from external impact.

[0003] In the prior art, the above-mentioned effect is usually achieved by providing a plastic bracket, which is provided above the temperature collection component, so as to support and protect the temperature collection component while pressing it downward to make it fit with the battery cell shell.

[0004] However, the above-mentioned plastic bracket needs to be set up separately and produced through injection molding. Power batteries of different sizes and specifications need to be designed with different plastic brackets, resulting in a high installation cost of the temperature collection component. Utility Model Content

[0005] The purpose of the present application is to provide a battery cell temperature collection component and a battery pack, which can solve the problem in the prior art that the temperature collection component needs to be separately provided with a plastic bracket, resulting in high production costs.

[0006] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, an embodiment of the present application provides a battery cell temperature collection component, and the battery cell temperature collection component includes a temperature measuring module and an adhesive. The temperature measuring module is attached to the shell of the battery cell to detect the temperature of the battery cell. The adhesive is partially connected to the side of the temperature measuring module away from the shell, and the adhesive is bonded to the battery cell to maintain the temperature measuring module and the shell in a fitted state. The battery cell is provided with a mounting structure and / or a tab protruding from the shell, and the mounting structure and / or the tab can cooperate with the shell to form a mounting groove, and the temperature measuring module is located in the mounting groove.

[0007] Based on the above-mentioned embodiments of the present application, when measuring the temperature of the battery cell, the temperature measurement module is first attached to the shell of the battery cell, and then the temperature measurement module and the shell of the battery cell are bonded and fixed by an adhesive, so that the temperature measurement module can stably maintain the fit with the shell of the battery cell, thereby ensuring the temperature measurement effect. At the same time, the mounting structure and the tab cooperate with the shell to form an installation groove, and the temperature measurement module is arranged in the installation groove, that is, the mounting structure and the tab form a structural support, so that the temperature measurement module with a lower height can be protected from the structural risks caused by external impact, thereby ensuring the safety of the temperature measurement module. Through the above-mentioned arrangement, without the need to separately set up structures such as injection molding parts, it is possible to ensure that the temperature measurement module and the shell of the battery cell are stably fitted, and the temperature measurement module can be supported and protected, thereby reducing the production and processing costs while realizing the assembly and fixation of the battery cell temperature measurement module.

[0008] In some embodiments, the height of the bar relative to the shell is greater than the height of the temperature measurement module relative to the shell; and / or the height of the mounting structure relative to the shell is greater than the height of the temperature measurement module relative to the shell.

[0009] Based on the above-mentioned embodiments of the present application, the height of the bar and the mounting structure is higher than the height of the temperature measurement module, so that the bar and the mounting structure form a structural support, thereby protecting the temperature measurement module from external impact.

[0010] In some embodiments, the temperature measurement module includes a thermistor.

[0011] Based on the above-mentioned embodiments of the present application, the temperature measurement module can be specifically set as a thermistor. When in use, the temperature change of the battery cell is reflected by the change in the resistance value of the thermistor, thereby realizing real-time monitoring of the temperature of the battery cell.

[0012] In some embodiments, the battery cell temperature collection component includes a circuit board, the end of the circuit board has a connecting portion, and the thermistor is connected to the connecting portion and is electrically connected to the circuit board.

[0013] Based on the above-mentioned embodiments of the present application, the battery cell temperature collection component is connected to the circuit board through the connecting part, thereby realizing conduction between the battery cell temperature collection component and the battery management system, thereby realizing the full process control of the battery cell temperature from monitoring to management.

[0014] In some embodiments, the connecting portion includes a plurality of middle segments, the plurality of middle segments are connected in sequence, and any two adjacent middle segments are arranged at an angle in the horizontal direction, and the thermistor is connected to the middle segment at the end.

[0015] Based on the above-mentioned embodiments of the present application, by setting multiple intermediate sections and setting any two adjacent intermediate sections at an angle, a multi-level bending effect is finally formed, so that the length of the intermediate section can be extended as much as possible within a limited setting space, and finally the distance from the main part of the circuit board to the thermistor is lengthened. At this time, when the main part such as the circuit board shakes, the path for the shaking to be transmitted from the main body of the circuit board to the thermistor is longer, so the force finally transmitted to the thermistor part is smaller, and finally the shaking amplitude of the thermistor is smaller, thereby reducing the influence of the shaking of components such as the circuit board on the fit between the thermistor and the battery cell shell.

[0016] In some embodiments, the heights of any two adjacent middle sections decrease in the vertical direction. The height difference between any two adjacent middle sections is H1, H1≤3mm; the total length of the connecting portion is L1, and the total height of the connecting portion is H2, L1≥H2.

[0017] Based on the above-mentioned embodiments of the present application, on the basis of the above-mentioned multi-stage bending of the middle section, by setting the height of the middle section to decrease in sequence, the height from the circuit board to the battery cell shell is slowly reduced. When the overall descending height of the connection part is constant, the descending height of a single middle section is relatively low, that is, the middle section is relatively gentle as a whole, so that the bending slope of any two middle sections is kept at a relatively gentle level, thereby avoiding the bending slope being too large when the temperature collection surface is bonded to the battery cell, and the reaction force greater than the peeling force of the adhesive bonding surface is generated at the bending part, causing the failure of the bonding between the thermistor and the battery cell shell, that is, the above-mentioned setting reduces the influence of the middle section on the bonding position between the thermistor and the battery cell. At the same time, by limiting the bending slope of the connection part, it is also possible to avoid the bending slope of the connection part being too large, resulting in stress concentration at the bending part to damage the wiring harness inside the connection part. Furthermore, the total length of the connection part is greater than or equal to the total height of the connection part, which further ensures that the overall bending slope of the connection part is small.

[0018] In some embodiments, in the direction from the circuit board to the thermistor, the widths of any two adjacent middle sections decrease successively, wherein the width of the middle section connected to the thermistor is L2, and the width of the middle section away from the thermistor is L3, L2≤4mm, L3>4mm.

[0019] Based on the above-mentioned embodiments of the present application, by setting the width of the middle section to decrease in sequence, that is, the width of the connection part decreases step by step from the end close to the circuit board to the end connected to the thermistor, the width of the middle section at the end where the connection part is connected to the main part of the circuit board is wider, thereby ensuring that there is sufficient connection strength between the two. If the width of the middle section at the end of the connection part close to the thermistor is narrower, the overlap area between the connection part and the adhesive can be reduced when the adhesive is used to potting and bonding the thermistor, thereby reducing the risk of excessive stress caused by bending and pulling in the overlap area.

[0020] In some embodiments, an insulating sheet is provided on the battery cell housing, a window area is provided on the insulating sheet, the thermistor is provided in the window area and is attached to the battery cell housing. The adhesive is provided in the window area, and at least part of the adhesive exceeds the window area and overlaps with the insulating sheet, and the overlap distance between the adhesive and the insulating sheet is L4, 1mm≤L4≤3mm.

[0021] Based on the above embodiments of the present application, the provision of the insulating sheet can insulate the battery cell and its adjacent components, and the provision of the window area enables the thermistor to measure the temperature of the battery cell more accurately. By providing the adhesive member and the insulating sheet to at least partially overlap, the bonding between the adhesive member and the battery cell is made more stable and reliable.

[0022] In some embodiments, the mounting structure is configured as a smoke exhaust channel, the smoke exhaust channel is fixedly disposed on the battery cell, and an explosion-proof valve adapted to the smoke exhaust channel is disposed on the battery cell.

[0023] Based on the above-mentioned embodiments of the present application, the smoke exhaust duct can not only serve as a mounting structure for supporting the temperature measurement module, but also adapt the smoke exhaust duct to the position of the explosion-proof valve. When thermal runaway occurs inside the battery, the explosion-proof valve opens and can quickly discharge the high-temperature smoke through the smoke exhaust duct, thereby reducing the damage caused by thermal runaway of the battery.

[0024] According to a second aspect of the present application, a battery pack is provided, comprising the above-mentioned battery cell temperature collection assembly.

[0025] Based on the above-mentioned embodiments of the present application, the battery pack provided by the present application includes the above-mentioned battery cell temperature collection component. When the above-mentioned temperature collection component is applied in the battery pack, the temperature measurement module is fixed on the battery cell shell by an adhesive, and the structural support formed by the mounting structure and the tabs protects the temperature measurement module from external impact, thereby achieving pressing and supporting protection for the temperature measurement module without the need to separately set up support structures such as injection molding parts, thereby reducing the overall production and processing cost of the battery pack.

[0026] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present application but do not constitute a limitation to the present application. In the accompanying drawings:

[0028] Figure 1 It is a structural schematic diagram of the battery cell temperature collection component provided in an embodiment of the present application.

[0029] Figure 2 It is a cross-sectional schematic diagram of the battery cell temperature collection component provided in an embodiment of the present application.

[0030] Figure 3 It is a structural schematic diagram of the temperature measurement module and the circuit board in the battery cell temperature sampling component provided in the embodiment of the present application.

[0031] Figure 4 yes Figure 3 Enlarged schematic diagram of part A.

[0032] Figure 5 It is a plan schematic diagram of the temperature measurement module and the circuit board in the battery cell temperature sampling assembly provided in an embodiment of the present application.

[0033] Figure 6 yes Figure 5 Schematic diagram of the enlarged portion B.

[0034] Figure 7 It is a plan view of the battery cell temperature collection component provided in an embodiment of the present application.

[0035] Figure 8 yes Figure 7 Enlarged schematic diagram of part C.

[0036] Description of Reference Numerals

[0037] 1. Temperature measurement module; 11. Thermistor; 2. Battery cell; 3. Adhesive; 4. Mounting structure; 41. Smoke exhaust channel; 5. Bar; 6. Circuit board; 61. Connecting part; 611. Middle section; 7. Window area. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of this application, it should be noted that, in the absence of any contrary explanation, the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0043] In the description of this application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In the prior art, the integrated busbar (Cells Contact System, CCS) module in the power battery generally adopts a plastic bracket to position and support it, especially the temperature sampling component connected to the integrated busbar for monitoring the battery temperature.

[0045] When the heating assembly is used, the heating structure needs to be attached to the heating surface of the battery cell, and on the other hand, a supporting structure needs to be set outside the heating structure to protect it from external impact. Therefore, in actual use, a plastic bracket is usually set outside the heating structure. On the one hand, the plastic bracket presses the heating structure to make it fit with the heating surface of the battery cell, and on the other hand, the elasticity of the plastic bracket itself is used to protect the heating structure from external impact.

[0046] However, the plastic bracket in the above structure needs to be set up separately and produced by injection molding. Different plastic brackets need to be designed for power batteries of different sizes, resulting in a high installation cost of the temperature collection component. In the current context of cost reduction and optimization, the integrated busbar is also gradually eliminating the plastic bracket structure. Therefore, it is necessary to provide a new temperature collection component that can achieve support protection and pressing effects for the temperature collection component while reducing costs.

[0047] In order to solve the above technical problems, refer to Figures 1 to 8As shown in , an embodiment of the present application provides a battery cell temperature collection component, which includes a temperature measuring module 1 and an adhesive 3. The temperature measuring module 1 is attached to the shell of the battery cell 2 to detect the temperature of the battery cell 2. The adhesive 3 is partially connected to the side of the temperature measuring module 1 that is away from the shell. The adhesive 3 is bonded to the battery cell 2 and maintains the temperature measuring module 1 and the shell in a fitted state. The battery cell 2 is provided with a mounting structure 4 and / or a tab 5 protruding from the shell. The mounting structure 4 and / or the tab 5 can cooperate with the shell to form a mounting groove, and the temperature measuring module 1 is in the mounting groove.

[0048] Based on the above-mentioned embodiments of the present application, when measuring the temperature of the battery cell 2, the temperature measuring module 1 is first attached to the shell of the battery cell 2, and then the temperature measuring module 1 and the shell of the battery cell 2 are bonded and fixed by the adhesive 3, so that the temperature measuring module 1 can stably maintain the fit with the shell of the battery cell 2, thereby ensuring the temperature measurement effect. At the same time, the mounting structure 4 and the bar piece 5 cooperate with the shell to form an installation groove, and the temperature measuring module 1 is set in the installation groove, that is, the mounting structure 4 and the bar piece 5 form a structural support, so that the temperature measuring module 1 with a lower height can be protected from the structural risks caused by external impact, thereby ensuring the safety of the temperature measuring module 1. Through the above-mentioned setting, without the need to separately set up structures such as injection molding parts, it is possible to ensure that the temperature measuring module 1 is fitted with the shell of the battery cell 2, and the temperature measuring module 1 can be supported and protected, thereby reducing the production and processing costs while realizing the assembly and fixation of the battery cell temperature collection component.

[0049] Specifically, in the present application, the adhesive 3 can be set to any suitable structure. In an exemplary embodiment provided in the present application, the adhesive 3 can be set to a thermally conductive structural adhesive, and the thermally conductive structural adhesive fixes the temperature measurement module 1 to the shell of the battery cell 2 by means of adhesive injection. When the thermally conductive structural adhesive is used, the temperature measurement module 1 can be fixed to the shell of the battery cell 2 by means of direct adhesive injection, or a mold can be pre-set outside the temperature measurement module 1 to limit the solidified shape of the thermally conductive structural adhesive when the thermally conductive structural adhesive is injected, so as to facilitate subsequent matching and assembly.

[0050] At the same time, the heat dissipation effect should also be considered when selecting the adhesive 3 to avoid affecting the measurement accuracy of the temperature measurement module 1 due to the setting of the adhesive 3.

[0051] In addition, in order to ensure that the temperature measuring module 1 and the shell of the battery cell 2 can be stably fitted when the adhesive 3 is fixed, in some embodiments of the present application, the temperature measuring module 1 and the shell of the battery cell 2 can be fixed by gluing to achieve a pre-positioning effect.

[0052] refer to Figure 2 As shown in , in some embodiments of the present application, the height of the bar 5 relative to the shell is greater than the height of the temperature measurement module 1 relative to the shell; and / or the height of the mounting structure 4 relative to the shell is greater than the height of the temperature measurement module 1 relative to the shell.

[0053] Based on the above-mentioned embodiments of the present application, the height of the bar 5 and the mounting structure 4 is higher than the height of the temperature measurement module 1, so that the bar 5 and the mounting structure 4 form a structural support, thereby protecting the temperature measurement module 1 from external impact.

[0054] Specifically, in the present application, the tab 5 and the mounting structure 4 can be set either one or at the same time, and can be set specifically according to factors such as the actual assembly space inside the battery pack.

[0055] In an exemplary embodiment provided in the present application, only the height of the bar 5 relative to the housing can be set to be greater than the height of the temperature measuring module 1 relative to the housing. In this case, when a downward impact occurs above the bar 5 and the temperature measuring module 1, the impact first acts on the bar 5 with a higher height, thereby forming a structural support through the bar 5 to reduce the risk of the temperature measuring module 1 being impacted. Similarly, only the height of the mounting structure 4 relative to the housing can be set to be greater than the height of the temperature measuring module 1 relative to the housing. In this case, the risk of the temperature measuring module 1 being impacted can also be reduced by supporting the mounting structure 4.

[0056] In addition, in another exemplary embodiment provided in the present application, the support structure may include both the bar 5 and the mounting structure 4, and the heights of the bar 5 and the mounting structure 4 relative to the shell are greater than the height of the temperature measurement module 1 relative to the shell.

[0057] Based on the above-mentioned embodiments of the present application, by simultaneously arranging the bar piece 5 and the mounting structure 4 to protrude from the temperature measuring module 1, and the bar piece 5 and the mounting structure 4 are respectively arranged on both sides of the temperature measuring module 1, when the structure above the temperature measuring module 1 is pressed downward, the bar piece 5 and the mounting structure 4 can support the pressed structure from both sides.

[0058] Specifically, by simultaneously providing the bar piece 5 and the mounting structure 4 on both sides of the temperature measuring module 1 as supporting structures, the above method can reduce the risk of the temperature measuring module 1 being impacted, compared with the method of only providing the bar piece 5 or only providing the mounting structure 4. For example, when a whole board structure is provided above the temperature measuring module 1, if only the bar piece 5 or only the mounting structure 4 is provided to support the whole board structure from one side, the whole board structure is likely to be concave to one side, causing the temperature measuring module 1 to be impacted and squeezed. However, by providing the bar piece 5 and the mounting structure 4 on both sides of the temperature measuring module 1 for simultaneous support, the risk of the whole board structure being concave to one side can be reduced.

[0059] Specifically, in the present application, the mounting structure 4 may include a smoke exhaust channel 41, etc., and the temperature measurement module 1 is supported by existing components in the battery pack such as the smoke exhaust channel 41, without the need to set up a separate supporting structure, thereby achieving a supporting and protective effect for the temperature measurement module 1 while reducing costs. The specific selection of the mounting structure 4 in specific use can be selected according to the strength of each component and the installation position, etc., and the present application does not impose specific restrictions on this.

[0060] In the present application, the temperature measuring module 1 can select any suitable temperature measuring element. In an exemplary embodiment of the present application, the temperature measuring module 1 can be set to a thermistor 11, such as a positive temperature coefficient (PTC) thermistor or a negative temperature coefficient (NTC) thermistor, etc., and the temperature of the battery cell 2 is measured by the change in resistance of the thermistor 11 at different temperatures. The temperature measuring element can be selected according to factors such as measurement accuracy requirements, and the present application does not impose specific restrictions on this.

[0061] refer to Figures 3 to 8 As shown in , in some embodiments of the present application, the battery cell temperature collection assembly includes a circuit board 6 , the end of the circuit board 6 has a connecting portion 61 , and the thermistor 11 is connected to the connecting portion 61 and is electrically connected to the circuit board 6 .

[0062] Based on the above-mentioned embodiments of the present application, the thermistor 11 monitors the temperature of the battery cell 2 through the temperature collection surface attached to the shell of the battery cell 2, and then transmits the monitoring data to the control module for thermal management and other functions through the circuit board 6, and finally transmits the temperature information of the battery cell 2 to the battery management system (Battery Management System, BMS), thereby realizing temperature monitoring and thermal management of the interior of the battery pack, especially the battery cell 2.

[0063] Specifically, in the present application, the circuit board 6 can be set as a flexible printed circuit (FPC). Compared with the traditional circuit board, the flexible circuit board has excellent characteristics such as light weight, thin thickness, and free bending and folding. In specific use, the flexible circuit board may include structures such as an insulating film, a conductor, and an adhesive. Since the present application does not involve improvements to the above structures, they will not be repeated here.

[0064] Further, refer to Figure 4 As shown in , in some embodiments provided in the present application, the connecting portion 61 may include multiple intermediate segments 611, the multiple intermediate segments 611 are connected in sequence, and any two adjacent intermediate segments 611 are arranged at an angle in the horizontal direction, and the thermistor 11 is connected to the intermediate segment 611 at the end.

[0065] Based on the above-mentioned embodiments of the present application, by setting a plurality of middle sections 611 and setting any two adjacent middle sections 611 at an angle, a multi-level bending effect is finally formed, so that the length of the middle section 611 can be extended as much as possible within a limited setting space, and finally the distance from the main part of the circuit board 6 to the thermistor 11 is lengthened. At this time, when the main part such as the circuit board 6 shakes, the path for the shaking to be transmitted from the main part of the circuit board 6 to the thermistor 11 is longer, so the force finally transmitted to the part of the thermistor 11 is smaller, and finally the shaking amplitude of the thermistor 11 is smaller, thereby reducing the influence of the shaking of components such as the circuit board 6 on the fit between the thermistor 11 and the battery cell 2 shell.

[0066] Specifically, in the present application, the number of the middle sections 611 can be selected in any suitable setting manner. In an exemplary embodiment provided in the present application, the middle section 611 can be provided with four sections, and the four middle sections 611 can be perpendicular to each other and connected in sequence to finally form an S-shaped bending structure, thereby ultimately reducing the force on the thermistor 11 when the circuit board 6 shakes, and the S-shaped bending structure can reduce the space occupied by the connecting portion 61.

[0067] In addition, in some other embodiments of the present application, the number of the middle sections 611 can also be set to two or three sections, or the middle sections 611 can also be set to five or six sections or even multiple sections. When setting specifically, it should be considered that the technical effect of reducing the shaking of the thermistor 11 can be achieved while avoiding too many sections of the middle sections 611 that occupy a large space. At the same time, too many sections of the middle sections 611 may also lead to a reduction in the strength of the connecting portion 61.

[0068] Furthermore, in order to enhance the connection strength between the middle segments 611 , in some embodiments of the present application, the connection positions of the middle segments 611 may be configured as rounded structures, thereby increasing the connection strength between any two adjacent middle segments 611 .

[0069] refer to Figure 4 As shown in , in some embodiments provided in the present application, the heights of any two adjacent middle sections 611 decrease successively in the vertical direction.

[0070] Based on the above-mentioned embodiments of the present application, by setting the height between the middle sections 611 to decrease successively, the height from the circuit board 6 to the thermistor 11 is slowly reduced, and finally the thermistor 11 is fitted with the heating surface of the battery cell 2, thereby avoiding that the bending slope from the circuit board 6 to the heating surface of the battery cell 2 is too large, resulting in excessive reaction force generated by the bending part, pulling the bonding surface between the thermistor 11 and the heating surface of the battery cell 2, causing bonding failure.

[0071] In addition, by setting the height of the middle section 611 to decrease successively, the final setting height of the thermistor 11 is lower, thereby expanding the height range in which the bar 5 and the mounting structure 4 can be set, thereby facilitating adjustment of the spatial arrangement of the components inside the battery pack.

[0072] Further, in the present application, the height difference between any two adjacent middle sections 611 is H1, H1≤3 mm, and the total length of the connecting portion 61 is L1, and the total height of the connecting portion 61 is H2, L1≥H2.

[0073] Based on the above-mentioned embodiments of the present application, on the basis of the multi-stage bending of the above-mentioned middle section 611, the height of the middle section 611 is set to decrease successively, so as to achieve a slow decrease in height from the circuit board 6 to the battery cell 2 shell. When the overall descending height of the connecting portion 61 is constant, the descending height of a single middle section 611 is relatively low, that is, the middle section 611 is relatively flat as a whole, so that the bending slope of any two middle sections 611 is maintained at a relatively flat level, thereby avoiding the bending slope being too large. When the temperature collection surface is bonded to the battery cell 2, a reaction force greater than the peeling force of the adhesive bonding surface is generated at the bending point, causing the bonding failure between the thermistor 11 and the battery cell 2. That is, the above-mentioned setting reduces the influence of the middle section 611 on the bonding position between the thermistor 11 and the battery cell 2.

[0074] At the same time, by limiting the bending slope of the connection part 61, it is also possible to avoid the connection part 61 bending slope being too large, resulting in stress concentration at the bending point and damaging the wiring harness inside the connection part 61. Furthermore, the total length of the connection part 61 is greater than or equal to the total height of the connection part 61, which further ensures that the overall bending slope of the connection part 61 is small.

[0075] Specifically, the specific value of the height difference between two adjacent intermediate sections 611 can be determined according to the total height of the connecting portion 61 and the number of the intermediate sections 611. For example, the total height H2 of the connecting portion 61 can generally be set to 8mm-9mm. When H2 is set to 9mm, if three intermediate sections 611 are set, the height difference H1 between two adjacent intermediate sections 611 is 3mm.

[0076] refer to Figure 5 and Figure 6 As shown in , in some embodiments provided in the present application, in the direction from the circuit board 6 to the thermistor 11 , the widths of any two adjacent middle sections 611 decrease successively.

[0077] Based on the above-mentioned embodiments of the present application, the width of the middle section 611 is set to decrease step by step, that is, the width of the middle section 611 is wider at the end close to the circuit board 6, and the width of the middle section 611 is narrower at the end close to the thermistor 11, thereby ensuring that the end where the connecting portion 61 is connected to the circuit board 6 has sufficient connection strength, and at the same time ensuring that the connection area where the connecting portion 61 is connected to the thermistor 11 is smaller, thereby ensuring a shorter overlap area of ​​the adhesive curing interface and reducing the risk of excessive stress caused by bending and pulling at the interface.

[0078] Specifically, the width of the middle section 611 connected to the thermistor 11 is L2, and the width of the middle section 611 away from the thermistor 11 is L3, L2≤4mm, L3>4mm.

[0079] Based on the above-mentioned embodiment of the present application, by setting the width of the middle section 611 to decrease in sequence, that is, the width of the connecting portion 61 decreases step by step from the end close to the circuit board 6 to the end connected to the thermistor 11, the width of the middle section 611 at the end where the connecting portion 61 is connected to the main part of the circuit board 6 is relatively wide, thereby ensuring that there is sufficient connection strength between the two. The width of the middle section 611 at the end of the connecting portion 61 close to the thermistor 11 is relatively narrow, which can reduce the overlap area between the connecting portion 61 and the adhesive 3 when the adhesive 3 is used to potting and bond the thermistor 11, thereby reducing the risk of excessive stress caused by bending and pulling in the overlap area.

[0080] refer to Figure 7 and Figure 8 As shown in , in some embodiments of the present application, an insulating sheet is provided on the shell of the battery cell 2, a window area 7 is provided on the insulating sheet, and the thermistor 11 is provided in the window area 7 and is attached to the shell of the battery cell 2. The adhesive 3 is provided in the window area 7, and the adhesive 3 at least partially exceeds the window area 7 and overlaps with the insulating sheet, and the overlap distance between the adhesive 3 and the insulating sheet is L4, 1mm≤L4≤3mm.

[0081] Based on the above-mentioned embodiments of the present application, the provision of the insulating sheet can insulate the battery cell 2 and its adjacent components, and the provision of the window area 7 enables the thermistor 11 to more accurately measure the temperature of the battery cell 2. By providing the adhesive 3 to at least partially overlap the insulating sheet, the bonding between the adhesive 3 and the battery cell 2 is made more stable and reliable.

[0082] refer to Figure 7 and Figure 8As shown in , in some embodiments of the present application, the adhesive 3 should be away from the bending position of the connection part 61. Specifically, the distance between the adhesive 3 and the transition area of ​​the bending position is L5, and L5>2mm. When the adhesive 3 is too close to the bending position of the connection part 61, it will cause bending failure. At this time, when the connection part 61 shakes, the force transmitted to the thermistor 11 and the adhesive 3 increases. Through the above arrangement, it is ensured that the force finally transmitted by the connection part 61 to the connection position of the thermistor 11 and the battery cell 2 is small, avoiding pulling the thermistor 11 to cause the connection failure between it and the battery cell 2 shell.

[0083] In some embodiments of the present application, the mounting structure 4 is configured as a smoke exhaust channel 41 , and the smoke exhaust channel 41 is fixedly disposed on the battery cell 2 . The battery cell 2 is provided with an explosion-proof valve adapted to the smoke exhaust channel 41 .

[0084] Based on the above-mentioned embodiments of the present application, the smoke exhaust channel 41 can be used as a mounting structure 4 to support the temperature measurement module 1, and at the same time, the smoke exhaust channel 41 can be adapted to the position of the explosion-proof valve. When thermal runaway occurs inside the battery, the explosion-proof valve opens and the high-temperature smoke can be quickly discharged through the smoke exhaust channel 41, thereby reducing the damage caused by thermal runaway of the battery.

[0085] Specifically, during use, a smoke exhaust hole can be set on the smoke exhaust channel 41, and the smoke exhaust hole can be connected to the explosion-proof valve of the battery. When thermal runaway occurs inside the battery, the explosion-proof valve is impacted and opened, and then the high-temperature smoke enters the smoke exhaust channel 41 through the explosion-proof valve and the smoke exhaust hole, and is finally discharged from the smoke exhaust channel 41.

[0086] On the basis of the above technical solution, according to the second aspect of the present application, a battery pack is provided, which includes the above temperature collection component.

[0087] Based on the above-mentioned embodiments of the present application, the battery pack provided by the present application includes the above-mentioned battery cell temperature collection component. When the above-mentioned temperature collection component is applied in the battery pack, the temperature measurement module 1 is fixed on the battery cell 2 shell by the adhesive 3, and the structural support formed by the mounting structure 4 and the bar 5 is used to protect the temperature measurement module 1 from external impact, thereby realizing the pressing and support protection of the temperature measurement module 1 without the need to separately set up support structures such as injection molding parts, thereby reducing the overall production and processing cost of the battery pack.

[0088] In addition, it should be noted that the battery pack in the present application may also include any other suitable structures, such as a frame and mounting beams for fixing battery cells, and a bottom guard plate and cold plate for protecting and cooling the battery cells respectively. The specific types and settings of the above structures can be selected according to the actual application conditions of the battery pack, etc., and the present application does not impose specific restrictions on this.

[0089] The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings; however, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, a variety of simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the protection scope of the present application.

[0090] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not further describe various possible combinations.

[0091] In addition, the various implementation modes of the present application may be arbitrarily combined, and as long as they do not violate the concept of the present application, they should also be regarded as the contents disclosed in the present application.

Claims

1. A battery cell temperature collection component, characterized in that: The battery core temperature collection component comprises: A temperature measuring module is attached to the shell of the battery cell to detect the temperature of the battery cell; An adhesive member, partially connected to a side of the temperature measuring module facing away from the housing, the adhesive member is bonded to the battery cell, and maintains the temperature measuring module and the housing in a fitted state; The battery cell is provided with a mounting structure and / or a tab protruding from the shell, and the mounting structure and / or the tab can cooperate with the shell to form a mounting groove, and the temperature measurement module is located in the mounting groove.

2. The battery cell temperature collection component according to claim 1, characterized in that: The height of the tab relative to the housing is greater than the height of the temperature measurement module relative to the housing; and / or A height of the mounting structure relative to the housing is greater than a height of the temperature measuring module relative to the housing.

3. The battery core temperature collection component according to claim 1, characterized in that: The temperature measurement module includes a thermistor.

4. The battery cell temperature collection component according to claim 3, characterized in that: The battery cell temperature collection component includes a circuit board, an end of the circuit board has a connecting portion, and the thermistor is connected to the connecting portion and is electrically connected to the circuit board.

5. The battery cell temperature collection component according to claim 4, characterized in that: The connecting portion includes a plurality of middle sections, the plurality of middle sections are connected in sequence, and any two adjacent middle sections are arranged at an angle in the horizontal direction, and the thermistor is connected to the middle section at the end.

6. The battery core temperature collection component according to claim 5, characterized in that: The heights of any two adjacent middle sections decrease in sequence in the vertical direction; The height difference between any two adjacent middle sections is H1, H1≤3mm; the total length of the connecting portion is L1, and the total height of the connecting portion is H2, L1≥H2.

7. The battery cell temperature collection component according to claim 5, characterized in that: In the direction from the circuit board to the thermistor, the widths of any two adjacent middle sections decrease successively, wherein the width of the middle section connected to the thermistor is L2, and the width of the middle section away from the thermistor is L3, L2≤4mm, L3>4mm.

8. The battery cell temperature collection component according to claim 5, characterized in that: An insulating sheet is provided on the battery cell shell, a window area is provided on the insulating sheet, and the thermistor is provided in the window area and is attached to the battery cell shell; The adhesive is arranged in the window area, and at least a part of the adhesive exceeds the window area and overlaps with the insulating sheet. The overlapping distance between the adhesive and the insulating sheet is L4, 1mm≤L4≤3mm.

9. The battery cell temperature collection component according to claim 2, characterized in that: The mounting structure is configured as a smoke exhaust channel, the smoke exhaust channel is fixedly disposed on the battery core, and an explosion-proof valve adapted to the smoke exhaust channel is disposed on the battery core.

10. A battery pack, characterized in that: The battery pack includes a battery cell temperature collection component as described in any one of claims 1 to 9.

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