Single cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a single battery cell and a battery pack. The single battery cell comprises a shell, an electrode assembly, a fixing piece and a temperature sensor, the electrode assembly and the fixing piece are arranged in the shell. The temperature sensor is installed on the fixing piece. The temperature sensor is used for acquiring the temperature of the electrode assembly. Therefore, the temperature of the electrode assembly can be directly obtained, and the accuracy of temperature measurement is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a single battery cell and battery package. BACKGROUND

[0002] In the related art, the charging and discharging temperature of the lithium ion battery seriously affects its electrical performance, safety and service life. Currently, a temperature sensor is usually arranged on the outer surface of the single battery cell to detect the charging and discharging temperature of the single battery cell. However, the temperature actually represents the temperature of the shell of the single battery cell, which makes it difficult to accurately obtain the temperature of the electrode assembly inside the single battery cell by using the temperature measurement method, resulting in low accuracy of the charging and discharging temperature detection of the single battery cell. SUMMARY

[0003] Embodiments of the utility model provide a single battery cell and battery package, which directly obtain the temperature of the electrode assembly by arranging the temperature sensor in the shell, thereby improving the accuracy of temperature detection and at least partially solving the above technical problems.

[0004] In a first aspect, embodiments of the utility model provide a single battery cell, which comprises:

[0005] a shell;

[0006] an electrode assembly arranged in the shell;

[0007] a fixing member arranged in the shell;

[0008] a temperature sensor connected to the fixing member, the temperature sensor being configured to obtain the temperature of the electrode assembly.

[0009] In an embodiment, the shell comprises a bottom plate, and the fixing member is connected to the bottom plate. The fixing member has a groove formed from its outer peripheral surface to its inner portion. The groove wall surface near one end of the groove close to the bottom plate forms a mounting position. The temperature sensor is fixed to the mounting position.

[0010] In an embodiment, the groove is provided as at least two grooves, and the at least two grooves are arranged at intervals along the circumference of the fixing member. The distance between each mounting position and the bottom plate is different.

[0011] In an embodiment, the temperature sensor is connected to a cable. The shell is provided with a through hole. The cable is arranged in the groove. The cable extends from the groove and passes out of the shell through the through hole.

[0012] In some embodiments, the shell further comprises a shell cover, the through hole is configured in the shell cover, wherein the fixing member has an end face close to the shell cover, the groove penetrates through the end face and forms a passing-out port, the cable extends out of the passing-out port and passes out of the shell cover through the through hole.

[0013] In an embodiment, the shell further comprises a bottom plate, the bottom plate is arranged in a spaced manner with the shell cover, wherein the opposite ends of the fixing member are in abutment with the bottom plate and the shell cover respectively.

[0014] In an embodiment, a sealing member is arranged in the through hole.

[0015] In an embodiment, the sealing member comprises:

[0016] a first sealing layer arranged in the through hole;

[0017] a second sealing layer arranged in the through hole, the second sealing layer is connected with the side of the first sealing layer away from the electrode assembly;

[0018] wherein the first sealing layer is solidified by a first glue, the second sealing layer is solidified by a second glue, the viscosity of the first glue is X1, the viscosity of the second glue is X2, and X1>X2 is satisfied.

[0019] In an embodiment, the adhesion of the first glue to the shell is Y1, the adhesion of the second glue to the shell is Y2, and Y1Y2 is satisfied.

[0020] In an embodiment, the cable comprises a conductive part and an insulating part, wherein the conductive part comprises a covered segment sleeved with the insulating part and a bare segment not sleeved with the insulating part, the bare segment is located in the through hole, and the bare segment is in sealing connection with the sealing member.

[0021] In an embodiment, the temperature sensor is spaced apart from the groove by a distance D1, and 0≤D1≤0.1 millimeter is satisfied.

[0022] In an embodiment, the electrode assembly has a winding channel extending in the height direction of the single battery cell, and the fixing member is arranged in the winding channel.

[0023] In an embodiment, the fixing member is spaced apart from the electrode assembly by a distance D2, and 0.05 millimeter≤D2≤0.15 millimeter is satisfied.

[0024] In a second aspect, an embodiment of the utility model provides a battery pack, comprising the single battery cell as described above.

[0025] The embodiment of the utility model has the following beneficial effects:

[0026] In the embodiment of the present application, the temperature sensor is installed by the fixing member, the fixing member is installed in the shell, and the temperature sensor is built in the shell, so that the temperature of the electrode assembly can be directly obtained. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0028] Figure 1 is a structural schematic diagram of a single battery cell provided by the embodiment of the present application;

[0029] Figure 2 is a structural schematic diagram of the fixing member under the first visual angle provided by the embodiment of the present application;

[0030] Figure 3 is a structural schematic diagram of the fixing member under the second visual angle provided by the embodiment of the present application;

[0031] Figure 4 is a partial structural schematic diagram of the single battery cell at the through hole provided by the embodiment of the present application.

[0032] Reference signs:

[0033] 10-shell, 110-shell cover, 120-bottom plate, 130-cylinder body, 140-through hole, 20-electrode assembly, 210-winding channel, 30-fixing member, 310-groove, 320-mounting position, 330-end face, 340-passing-out port, 40-temperature sensor, 50-cable, 510-conductive part, 5110-coated section, 5120-bare section, 520-insulating part, 60-sealing member, 610-first sealing layer, 620-second sealing layer. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower positions of the device in the actual use or working state, and specifically refer to the drawing direction in the drawings. The "inner" and "outer" refer to the outline of the device.

[0035] As shown in Figures 1 to 4 The single battery cell provided by the embodiment of the present application includes a shell 10, an electrode assembly 20, a fixing member 30 and a temperature sensor 40. The electrode assembly 20 and the fixing member 30 are arranged in the shell 10. The temperature sensor 40 is installed on the fixing member 30. The temperature sensor 40 is used to obtain the temperature of the electrode assembly 20.

[0036] In the embodiment of the present application, the temperature sensor 40 is installed by the fixing member 30, so that the fixing member 30 is installed in the shell 10, and the temperature sensor 40 is built in the shell 10, thereby directly obtaining the temperature of the electrode assembly 20. Therefore, the accuracy of temperature measurement is improved.

[0037] It should be noted that the fixing member 30 is made of an insulating material, and the fixing member 30 has a certain structural strength, so that after the temperature sensor 40 is installed on the fixing member 30, the temperature sensor 40 can be fixed at a certain height position inside the shell 10 through the fixing member 30, so as to ensure that the temperature sensor 40 can monitor the charging and discharging temperature of the height position in real time. For example, the fixing member 30 is made of PP (Polypropylene) material or PE (Polyethylene) material. The fixing member 30 can be provided in any shape such as a cylindrical shape, a prism shape, an elliptical cylindrical shape, etc.

[0038] The temperature sensor 40 can be fixed at any height position of the fixing member 30 based on actual needs. The temperature sensor 40 can be adhered to the outer surface of the fixing member 30 by using an adhesive or adhesive tape. Alternatively, the temperature sensor 40 can be installed on the fixing member 30 by using a buckle connection or the like.

[0039] After the temperature sensor 40 is fixed on the fixing member 30, the temperature sensor 40 can be as close to the electrode assembly 20 as possible. Therefore, the accuracy of temperature measurement can be maximized.

[0040] It should be noted that the temperature sensor 40 and / or the fixing member 30 can be attached to the electrode assembly 20, in which case the temperature measurement accuracy is the highest. It is only necessary to ensure that the fixing member 30 does not scratch or press the electrode assembly 20 during the installation stage to cause the deformation and damage of the separator. Alternatively, the temperature sensor 40 and / or the fixing member 30 are arranged to be spaced apart from the electrode assembly 20, so that the fixing member 30 maintains a certain spacing from the electrode assembly 20 during the installation process, thereby ensuring that the fixing member 30 does not scratch or press the electrode assembly 20 during the installation stage to cause the deformation and damage of the separator.

[0041] The single battery cell in the embodiments of the present application includes a jelly-roll type battery cell and a stacked type battery cell. When the single battery cell is a jelly-roll type battery cell, the fixing member 30 can be arranged in the winding channel 210 of the electrode assembly 20. When the single battery cell is a stacked type battery cell, the fixing member 30 can be arranged in the region between the electrode assembly 20 and the case 10.

[0042] As shown in FIG. 1, in some embodiments, the case 10 includes a case cover 110 and a bottom plate 120 arranged opposite to each other. The fixing member 30 is connected to the bottom plate 120. The fixing member 30 is formed with a groove 310 from its outer peripheral surface to its inner portion. The groove 310 is formed with a mounting site 320 on the groove wall surface close to one end of the bottom plate 120. The temperature sensor 40 is fixed to the mounting site 320. Figures 1 to 3

[0043] It can be understood that the groove 310 is formed on the fixing member 30, and the temperature sensor 40 is fixed to the mounting site 320 formed on the groove wall surface of the groove 310, so as to achieve the reliable fixation of the temperature sensor 40. At the same time, based on the arrangement of the groove 310, on the one hand, the temperature sensor 40 can be prevented from directly contacting the electrode assembly 20 after being fixed to the fixing member 30, and on the other hand, the groove 310 can be used as a wiring channel to achieve the electrical connection between the temperature sensor 40 and the external terminal device.

[0044] It should be noted that based on the arrangement of the groove 310, the temperature measurement end of the temperature sensor 40 can also be located in the groove 310, in which case the fixing member 30 can be attached to the inner surface of the winding channel 210 of the electrode assembly 20. Since the connecting surfaces of the two are large and the fixation between the fixing member 30 and the case is very firm, the fixing member 30 generally does not damage the separator on the surface of the electrode assembly 20. Of course, in order to prevent the influence of manufacturing tolerances from causing the size of the fixing member 30 to exceed the winding channel 210 of the electrode assembly 20, the outer surface of the fixing member 30 can also be arranged to be spaced apart from the surface of the electrode assembly 20 during the design stage.

[0045] ​In some embodiments, the fastener 30 may be cylindrical. A groove 310 is formed on the outer surface of the fastener 30. The height position of the mounting position 320 can be determined based on the extension length of the groove 310. Thus, the extension length of the groove 310 can be selected according to the mounting height of the temperature sensor 40.

[0046] In some embodiments, the cross-section of the groove 310 can be set to an arc shape, square shape, U shape, V shape, etc., to ensure that the temperature sensor 40 can be installed in the mounting position 320 formed by the groove 310.

[0047] In some embodiments, the housing 10 further includes a cylindrical body 130. A bottom plate 120 is connected to the bottom of the cylindrical body 130. A cover 110 is fitted onto the top of the cylindrical body 130. When the individual battery cell is a cylindrical cell, the cylindrical body 130 is cylindrical, and both the bottom plate 120 and the cover 110 are circular. When the individual battery cell is a prismatic cell, the cylindrical body 130 is prismatic, and both the bottom plate 120 and the cover 110 are prismatic.

[0048] like Figure 2 and Figure 3 As shown, in some embodiments, at least two grooves 310 are provided. At least two grooves 310 are spaced apart circumferentially along the fastener 30. The distance between each mounting position 320 and the base plate 120 is different.

[0049] It is understandable that by redundantly setting the grooves 310, when a single cell needs to measure the temperature at multiple height positions, a temperature sensor 40 can be installed in different grooves 310 to achieve multi-point temperature acquisition.

[0050] like Figure 1 As shown, the fixing member 30 is vertically installed inside the housing 10. The distance between the mounting position 320 and the base plate 120 determines the mounting height of the temperature sensor 40. Since the distance between each mounting position 320 and the base plate 120 is different, each mounting position 320 can be at a different height. Therefore, the charging and discharging temperature inside a single battery cell can be measured at different heights, thus ensuring the accuracy of temperature detection.

[0051] For example, three grooves 310 are spaced apart circumferentially along the fastener 30, namely the first groove, the second groove, and the third groove. The first, second, and third grooves are all arc-shaped. The mounting position 320 of the first groove is located near the bottom of the electrode assembly 20, thereby acquiring the temperature parameters at the bottom of the electrode assembly 20. The mounting position 320 of the second groove is located in the middle of the electrode assembly 20, thereby acquiring the temperature parameters at the middle of the electrode assembly 20. The mounting position 320 of the third groove is located near the top of the electrode assembly 20, thereby acquiring the temperature parameters at the top of the electrode assembly 20.

[0052] In some embodiments, the temperature sensor 40 is connected with a cable 50. The housing 10 is configured with a through hole 140. The cable 50 is arranged in the groove 310. In this case, the cable 50 extends from the groove 310 and passes out of the housing 10 through the through hole 140.

[0053] It can be understood that the cable 50 needs to be electrically connected to a terminal device after passing out of the through hole 140. Based on the cable 50 connecting the temperature sensor 40, the cable 50 passes out of the through hole 140 of the housing 10 to realize the transmission of the temperature parameter to the external terminal device.

[0054] It should be noted that the size of the groove 310 can be the same as the size of the cable 50, so that each groove 310 can accommodate one cable 50. Alternatively, the size of the groove 310 can be larger than the size of the cable 50 to ensure that the cable 50 can be arranged along the groove 310.

[0055] When a plurality of temperature sensors 40 are installed on the fixing member 30, a plurality of grooves 310 are formed on the fixing member 30. At this time, one cable 50 is arranged in each groove 310.

[0056] In some embodiments, the through hole 140 is arranged on the shell cover 110. Alternatively, the through hole 140 is arranged on the barrel body 130. Alternatively, the through hole 140 is arranged on the bottom plate 120. The shape of the through hole 140 can be circular, square, oval, or any other shape, as long as all the cables 50 can pass out of one through hole 140.

[0057] In some embodiments, the through hole 140 is configured on the shell cover 110. In this case, the fixing member 30 has an end surface 330 close to the shell cover 110. The groove 310 penetrates the end surface 330 and forms a through opening 340. The cable 50 extends from the through opening 340 and passes out of the shell cover 110 through the through hole 140.

[0058] It can be understood that based on the groove 310 penetrating the end surface 330, the cable 50 can be arranged directly from the through opening 340 out of the groove 310. And based on the through hole 140 being arranged on the shell cover 110 and the through opening 340 facing the shell cover 110, when the cable 50 passes out of the through opening 340, it can directly pass out of the shell cover 110 through the through hole 140 in the shortest path, so as to facilitate the arrangement of the cable 50.

[0059] In some embodiments, the housing 10 further includes a bottom plate 120. The bottom plate 120 is arranged in a spaced manner with the shell cover 110. In this case, the opposite ends of the fixing member 30 are in abutment with the bottom plate 120 and the shell cover 110, respectively.

[0060] It can be understood that the length of the fixing member 30 can be matched with the height of the shell 10, so that after the fixing member 30 is arranged inside the shell 10, the upper and lower ends of the fixing member 30 abut against the shell cover 110 and the bottom plate 120 respectively to realize the fixation of the fixing member 30. Thus, other structures are not needed to position the fixing member 30, and the quick assembly of the single battery cell is realized.

[0061] In some embodiments, the fixing member 30 can also be bonded with the bottom plate 120 through structural glue to ensure the reliable fixation of the fixing member 30 in the shell 10.

[0062] In some embodiments, the through hole 140 is provided with a sealing member 60.

[0063] It can be understood that the through hole 140 is sealed by the sealing member 60 to prevent the leakage of the electrolyte from the through hole 140, and the sealing property of the single battery cell is ensured.

[0064] In some embodiments, the sealing member 60 includes a first sealing layer 610 and a second sealing layer 620. The first sealing layer 610 is arranged in the through hole 140. The second sealing layer 620 is arranged in the through hole 140. The second sealing layer 620 is connected to the side of the first sealing layer 610 away from the electrode assembly 20. The first sealing layer 610 is formed by solidification of first glue. The second sealing layer 620 is formed by solidification of second glue. The viscosity of the first glue is X1, and the viscosity of the second glue is X2, which satisfy X1>X2.

[0065] It can be understood that the double-layer sealing structure is formed by the first sealing layer 610 and the second sealing layer 620 to ensure the effectiveness of the long-term sealing of the through hole 140, and meet the test and use requirements of the single battery cell in the oil bath module level.

[0066] In the embodiments of the present application, the viscosity of the first glue is greater than that of the second glue, and the first glue can be dripped into the through hole 140 first. After the first glue is solidified into the first sealing layer 610 in the through hole 140, the second glue is dripped into the through hole 140. After the second glue is solidified to form the second sealing layer 620, the second sealing layer 620 is connected to the first sealing layer 610 on the side of the first sealing layer 610 away from the second sealing layer 620. It can be seen that the first glue mainly serves as a structure for supporting the second glue to ensure that the second glue can be arranged in the through hole 140.

[0067] It should be noted that when the first glue is dripped into the through hole 140, it is necessary to ensure that the first glue can adhere to the hole wall surface of the first through hole 140 and will not drip into the inside of the shell 10 from the through hole 140. 4 MPa·S≤X1≤10 5 MPa·S (megapascal·second), 10 3 MPa·S≤X2≤10 4MPa·S.

[0068] In some embodiments, both the first adhesive and the second adhesive are epoxy resin adhesives, so that both the first sealing layer 610 and the second sealing layer 620 are epoxy resin layers. The first sealing layer 610 can be a yellow sealing layer, a white sealing layer, a milky white sealing layer, or a transparent sealing layer. The second sealing layer 620 can be a transparent sealing layer.

[0069] In some embodiments, both the first sealing layer 610 and the second sealing layer 620 have superior corrosion resistance to prevent the first sealing layer 610 and the second sealing layer 620 from being corroded by the electrolyte and the environment (e.g., cooling oil).

[0070] In some embodiments, the adhesive force of the first adhesive to the housing 10 is Y1, and the adhesive force of the second adhesive to the housing 10 is Y2, satisfying that Y1 < Y2.

[0071] It is understandable that, based on the fact that the adhesive force of the first adhesive to the housing 10 is less than that of the second adhesive to the housing 10, the sealing performance of the second sealing layer 620 is greater than that of the first sealing layer 610. That is, the first adhesive with higher viscosity mainly serves as a supporting structure for the second adhesive, while the second adhesive with better adhesion mainly serves as an airtight structure. Of course, the first sealing layer 610 formed by the first adhesive can also serve as an airtight structure. In this embodiment, through the synergistic cooperation of the first sealing layer 610 and the second sealing layer 620, the sealing element 60 achieves a good sealing effect, ensuring the long-term sealing effectiveness of the through hole 140 and meeting the testing and usage requirements of individual battery cells at the oil bath module level.

[0072] For example, the housing 10 is made of steel. In this case, 30 N / mm² 2 ≤Y1≤40N / mm 2 (N / cm²), 30N / mm 2 ≤Y2≤40N / mm 2 Although Y1 and Y2 have the same range of values, in actual material selection, the adhesive force Y1 of the first glue is always less than the adhesive force Y2 of the second glue.

[0073] For example, housing 10 is made of aluminum. In this case, 15 N / mm² 2 ≤Y1≤24N / mm 2 17 N / mm 2 ≤Y2≤25N / mm 2 Although the ranges of Y1 and Y2 overlap to some extent, in actual material selection, the adhesive force Y1 of the first glue is always less than the adhesive force Y2 of the second glue.

[0074] like Figure 4As shown, in some embodiments, the cable 50 includes a conductive portion 510 and an insulating portion 520. The conductive portion 510 includes a covered segment 5110 covered by the insulating portion 520 and an exposed segment 5120 not covered by the insulating portion 520. The exposed segment 5120 is located in the through hole 140, and the exposed segment 5120 is sealingly connected to the sealing member 60.

[0075] It can be understood that, by making the cable 50 in the exposed state in the through hole 140 and sealingly fixing the exposed segment 5120 in the through hole 140 by the sealing member 60, the leakage of the electrolyte inside the shell 10 from the cable 50 between the insulating portion 520 and the conductive portion 510 out of the shell 10 can be prevented.

[0076] It should be noted that, at the connection between the cable 50 and the temperature sensor 40, the insulating portion 520 needs to be stripped to realize the electrical connection between the cable 50 and the temperature sensor 40. Since the temperature sensor 40 and the part of the cable 50 inside the shell 10 are immersed in the electrolyte. If the cable does not form the exposed segment 5120 at the through hole 140, when the electrolyte enters the insulating portion 520 from the stripped position of the cable 50 close to the temperature sensor 40, the electrolyte may flow outwards along the internal channel of the insulating portion 520, causing the single cell to leak. In the embodiments of the present application, the cable 50 at the position of the through hole 140 is provided as the exposed segment 5120, so as to cut off the internal channel of the insulating portion 520. Even if the electrolyte enters the insulating portion 520 from the stripped position of the cable 50 close to the temperature sensor 40, the electrolyte in the internal channel of the insulating portion 520 will also be discharged at the position close to the through hole 140. Based on the sealing effect of the sealing member 60, the part of the electrolyte will not leak out of the through hole 140, thereby preventing the single cell from leaking.

[0077] It should be noted that, when one cable 50 includes multiple layers of insulating portions 520, all the insulating portions 520 need to be stripped at the position of the through hole 140.

[0078] In some embodiments, the temperature sensor 40 and the slot opening of the groove 310 have a spacing D1, which satisfies: 0≤D1≤0.1 millimeter.

[0079] It can be understood that the smaller the distance between the temperature sensor 40 and the groove 310 notch, the closer the temperature sensor 40 to the electrode assembly 20, and the higher the temperature measurement accuracy. The greater the distance between the temperature sensor 40 and the groove 310 notch, the smaller the risk of the temperature sensor 40 penetrating the groove 310, and the lower the risk of the temperature sensor 40 damaging the separator. When the distance between the temperature sensor 40 and the groove 310 notch is greater than 0.1 mm, the temperature measurement accuracy of the temperature sensor 40 will be significantly reduced, so the distance between the temperature sensor 40 and the groove 310 notch is set to be in the range of 0-0.1 mm to ensure the temperature measurement accuracy and reduce the risk of the separator being damaged by the temperature sensor 40.

[0080] For example, the distance between the temperature sensor 40 and the groove 310 notch is set to 0 mm, 0.05 mm, 0.1 mm, or any value between any two of them.

[0081] In some embodiments, the electrode assembly 20 has a winding channel 210 extending in the direction of the single cell height, and the fixing member 30 is arranged in the winding channel 210.

[0082] It can be understood that by arranging the fixing member 30 in the winding channel 210, on the one hand, it does not occupy other space inside the shell 10 to ensure the energy density of the single cell. On the other hand, it does not affect the normal installation of the electrode assembly 20, so that the single cell can be compatible with the normal assembly process without the need to modify the equipment on the manufacturing line.

[0083] It should be noted that when the electrode assembly 20 has a winding channel 210, the single cell is a winding cell. At this time, the electrode assembly 20 can be arranged in a circular ring shape or a racetrack shape. The hollow area of the circular ring or racetrack forms the winding channel 210. The shape of the fixing member 30 can be adapted to the shape of the winding channel 210, and the size of the fixing member 30 can be the same as the size of the winding channel 210. Alternatively, the size of the fixing member 30 is smaller than the size of the winding channel 210, so that a certain gap is formed between the fixing member 30 and the inner surface of the electrode assembly 20, preventing the fixing member 30 from being damaged by the fixing member 30 during the process of installing the fixing member 30 in the winding channel 210 of the electrode assembly 20.

[0084] In some embodiments, the distance between the fixing member 30 and the electrode assembly 20 is D2, which satisfies: 0.05 mm≤D2≤0.15 mm.

[0085] It can be understood that, based on the fixed part 30 is spaced apart from the electrode assembly 20, in the process of the fixed part 30 is installed in the winding channel 210 of the electrode assembly 20, the fixed part 30 will not extrude the electrode assembly 20 to prevent the fixed part 30 and / or temperature sensor 40 extrusion of the diaphragm and cause the diaphragm damaged. Based on the fixed part 30 installation process will not cause the diaphragm damaged, even if the fixed part 30 and / or temperature sensor 40 and the diaphragm have local contact, the diaphragm will not be damaged due to local contact, to ensure the safe use of single battery.

[0086] When the distance between the fixed part 30 and the electrode assembly 20 is less than 0.05mm, when the fixed part 30 is oversized due to manufacturing tolerance, the fixed part 30 may be extruded to the electrode assembly 20 during installation, causing the diaphragm damaged. When the distance between the fixed part 30 and the electrode assembly 20 is greater than 0.15mm, the temperature sensor 40 and the electrode assembly 20 will be too far apart, resulting in temperature measurement accuracy decreased.

[0087] For example, the distance between the fixed part 30 and the electrode assembly 20 is set to 0.05mm, 0.1mm, 0.15mm, or any value between any two of them.

[0088] The application also provides a battery pack. The battery pack includes the single battery as in the foregoing embodiments.

[0089] In the embodiments of the application, the temperature sensor 40 is installed by the fixed part 30, so that the fixed part 30 is installed in the shell 10, and the temperature sensor 40 can be built-in in the shell 10, so as to directly obtain the temperature of the electrode assembly 20. Therefore, the accuracy of temperature measurement is improved.

[0090] It can be understood that the battery pack includes a battery box and at least one battery module arranged in the battery box. Each battery module includes a plurality of single batteries as in the foregoing embodiments.

[0091] The embodiments of the application are described in detail above, and the principle and implementation mode of the application are described by applying specific examples. The above embodiment is only used to help understand the method and core idea of the application; at the same time, for those skilled in the art, according to the idea of the application, the specific implementation mode and application range will be changed, and the above description should not be understood as limiting the application.

Claims

1. A monobloc cell, characterized in that, include: case; Electrode assembly, disposed within the housing; The fastener is located inside the housing; A temperature sensor, connected to the fixture, is used to acquire the temperature of the electrode assembly.

2. The monobloc cell of claim 1, wherein, The housing includes a base plate, and the fixing member is connected to the base plate. The fixing member has a groove formed from its outer periphery to its interior. The groove wall near one end of the base plate forms a mounting position, and the temperature sensor is fixed to the mounting position.

3. The monobloc cell of claim 2, wherein, The grooves are provided in at least two locations, and the at least two grooves are spaced apart circumferentially along the fastener, wherein the distance between each mounting position and the base plate is different.

4. The monobloc cell of claim 2, wherein, The temperature sensor is connected to a cable, and the housing has a through hole. The cable is located in the groove, and extends out of the groove and passes through the through hole to exit the housing.

5. The monobloc cell of claim 4, wherein, The housing also includes a cover, the through hole being formed in the cover, wherein the fastener has an end face near the cover, the groove penetrates the end face and forms a through outlet, the cable extends from the through outlet and passes through the through hole out of the cover.

6. The monobloc cell of claim 5, wherein, The housing also includes a base plate, which is spaced apart from the housing cover, wherein the opposite ends of the fixing member abut against the base plate and the housing cover respectively.

7. The monobloc cell of claim 4, wherein, A sealing element is provided inside the through hole.

8. The monobloc cell of claim 7, wherein, The sealing element includes: A first sealing layer is disposed within the through hole; A second sealing layer is disposed within the through hole, and the second sealing layer is connected to the side of the first sealing layer away from the electrode assembly. Wherein, the first sealing layer is formed by solidifying a first adhesive, and the second sealing layer is formed by solidifying a second adhesive. The viscosity of the first adhesive is X1, and the viscosity of the second adhesive is X2, satisfying that X1 > X2.

9. The monobloc cell of claim 8, wherein, The adhesive force of the first adhesive to the shell is Y1, and the adhesive force of the second adhesive to the shell is Y2, satisfying that Y1 < Y2.

10. The monobloc cell of claim 7, wherein, The cable includes a conductive part and an insulating part. The conductive part includes a covered section that is fitted with the insulating part and an exposed section that is not fitted with the insulating part. The exposed section is located inside the through hole and is sealed to the sealing element.

11. The monobloc cell of claim 2, wherein, The distance between the temperature sensor and the groove opening is D1, which satisfies: 0≤D1≤0.1 mm.

12. The monobloc cell of any one of claims 1-11, wherein, The electrode assembly has a winding channel extending along the height direction of the individual cell, and the fixing member is disposed within the winding channel.

13. The monobloc cell of claim 12, wherein, The distance between the fixing member and the electrode assembly is D2, which satisfies the condition: 0.05 mm ≤ D2 ≤ 0.15 mm.

14. A battery pack, characterized by Includes a single battery cell as described in any one of claims 1 to 13.

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