Battery and battery pack

Abstract

The present application belongs to the technical field of batteries. Disclosed are a battery and a battery pack. The battery comprises: a case, which is provided with an accommodating cavity and a first hole in communication with the accommodating cavity; an electrode assembly, which is arranged in the accommodating cavity; a monitoring assembly, which comprises a substrate, a temperature sensing portion arranged on the substrate and a pressure sensing portion arranged on the substrate, wherein at least part of the substrate passes through the first hole, and the temperature sensing portion and the pressure sensing portion are both located in the accommodating cavity; and a fixing member, at least part of which penetrates the substrate, and which connects the case to the substrate, so as to fix the substrate. The present application facilitates timely monitoring of internal temperature and pressure changes of the battery, thereby improving the timeliness and accuracy in terms of battery abnormality monitoring. Moreover, by means of the fixing member penetrating the substrate and connecting the case to the substrate, the mounting stability of the monitoring assembly is further improved.

Description

Battery and battery pack

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202421519195.6, filed on June 28, 2024, and entitled "A battery and battery pack", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application belongs to the technical field of batteries, and specifically relates to a battery and battery pack. BACKGROUND

[0004] At present, in order to monitor abnormal conditions in the use of the battery in time, a temperature measuring device such as a thermocouple is usually attached to the outside of the battery to monitor the surface temperature change of the battery in real time.

[0005] However, when the battery has abnormal conditions such as thermal runaway, the temperature needs to be conducted to the temperature measuring device through the battery shell, which has a certain hysteresis, so that monitoring the surface temperature change of the battery has relatively poor timeliness and accuracy in monitoring abnormal conditions of the battery. SUMMARY

[0006] The present application aims to provide a battery to solve the above technical problems, and another purpose of the present application is to provide a battery pack using the above battery.

[0007] TECHNICAL SOLUTION The battery provided by the embodiments of the present application comprises:

[0008] A shell having a receiving cavity and a first hole communicating with the receiving cavity;

[0009] An electrode assembly arranged in the receiving cavity;

[0010] A monitoring assembly comprising a base, a temperature sensing portion arranged on the base, and a pressure sensing portion arranged on the base, at least a part of the base penetrating through the first hole, and the temperature sensing portion and the pressure sensing portion being located in the receiving cavity;

[0011] A fixing member, at least a part of the fixing member penetrating through the base, and the fixing member connecting the shell and the base to fix the base.

[0012] In some embodiments, the base includes a base portion and a positioning portion, the base portion is disposed through the first hole, and the positioning portion is connected to a side of the shell away from the electrode assembly, the positioning portion is provided with a second hole, and a portion of the fixing member is disposed through the second hole and connected to the shell and the positioning portion.

[0013] In some embodiments, the side of the shell away from the electrode assembly is provided with a first annular groove, the first annular groove surrounds the first hole, and the first annular groove is in communication with the first hole.

[0014] The positioning portion surrounds the base portion and is embedded in the first annular groove.

[0015] In some embodiments, the shell is provided with a third hole in communication with the accommodating cavity, and the third hole is in communication with the second hole.

[0016] The fixing member includes a first portion, a second portion, and a third portion, the second portion is disposed through the second hole and the third hole, the third portion is located in the accommodating cavity, the first portion is located on a side of the second portion away from the accommodating cavity, and the first portion and the third portion clamp the positioning portion and the shell.

[0017] In some embodiments, the second hole and the third hole are each provided with a plurality of holes, the second portion is provided with a plurality of second portions, the plurality of second portions are connected to the first portion and the third portion respectively, and each second portion corresponds to each second hole and each third hole.

[0018] In some embodiments, the first portion is disposed around a center of the first hole.

[0019] And / or, the third portion is disposed around the center of the first hole.

[0020] In some embodiments, the side of the shell away from the electrode assembly is provided with a second annular groove, the second annular groove surrounds the first annular groove, the second annular groove is in communication with the first annular groove, and at least a portion of the first portion is embedded in the second annular groove.

[0021] In some embodiments, the shell is provided with a fourth hole facing the positioning portion, and the fourth hole is in communication with the second hole.

[0022] A portion of the fixing member is disposed through the second hole and the fourth hole, and the fixing member is threadedly connected to the shell.

[0023] In some embodiments, the second hole and the fourth hole are each provided with a plurality of holes, and the fixing member is provided with a plurality of fixing members, each fixing member corresponds to each second hole and each fourth hole.

[0024] In some embodiments, a first ring groove is formed on a side of the shell away from the electrode assembly, the first ring groove surrounds the first hole and is in communication with the first hole, and the positioning portion surrounds the base and is embedded in the first ring groove.

[0025] The battery further includes a sealing gasket embedded in the first ring groove, the sealing gasket surrounds the base, and the sealing gasket is located between the positioning portion and the shell, the sealing gasket is provided with a fifth hole in communication with the second hole and the fourth hole respectively, and part of the fixing member penetrates the fifth hole.

[0026] In some embodiments, the shell includes a shell body and a top cover connected to each other, the shell body and the top cover enclose the accommodation cavity, and at least one of the shell body and the top cover is provided with the first hole.

[0027] In some embodiments, the monitoring assembly further includes a wiring portion located on a side of the base body away from the pressure sensing portion and the temperature sensing portion.

[0028] In some embodiments, the third portion is designed to have a thickness greater than that of the first portion and not greater than twice the thickness of the first portion.

[0029] Correspondingly, the battery pack according to the embodiments of the present application includes the battery described above.

[0030] Beneficial effects: The battery according to the embodiments of the present application includes a shell, an electrode assembly, a monitoring assembly, and a fixing member. The shell has an accommodation cavity and a first hole in communication with the accommodation cavity; the electrode assembly is arranged in the accommodation cavity; the monitoring assembly includes a base body, a temperature sensing portion arranged on the base body, and a pressure sensing portion arranged on the base body, at least part of the base body penetrates the first hole, and the temperature sensing portion and the pressure sensing portion are both located in the accommodation cavity; at least part of the fixing member penetrates the base body, and the fixing member connects the shell and the base body to fix the base body. By arranging the temperature sensing portion and the pressure sensing portion in the accommodation cavity respectively, the temperature and pressure changes inside the battery can be monitored in time, and the timeliness and accuracy of the monitoring of abnormal conditions of the battery are improved. At the same time, by penetrating the base body and connecting the shell and the base body, the installation stability of the monitoring assembly is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] 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 as follows. 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 effort.

[0032] Fig. 1 is a structural schematic diagram of a top cover, a monitoring assembly and a fixing member of Embodiment 1 of the present application;

[0033] Fig. 2 is an exploded structural schematic diagram of the monitoring assembly and the fixing member of Embodiment 1 of the present application;

[0034] Fig. 3 is a structural schematic diagram of a front view of a top cover of Embodiment 1 of the present application;

[0035] Fig. 4 is a partial sectional view along line A-A in Fig. 3;

[0036] Fig. 5 is a structural schematic diagram of a top cover, a monitoring assembly and a fixing member of Embodiment 2 of the present application;

[0037] Fig. 6 is an exploded structural schematic diagram of the monitoring assembly and the fixing member of Embodiment 2 of the present application;

[0038] Fig. 7 is a structural schematic diagram of a front view of a top cover of Embodiment 2 of the present application;

[0039] Fig. 8 is a partial sectional view along line B-B in Fig. 3;

[0040] Reference signs: 1, housing; 10, accommodating cavity; 11, first hole; 12, first annular groove; 13, third hole; 14, second annular groove; 15, fourth hole; 16, shell; 17, top cover; 18, pole; 2, electrode assembly; 3, monitoring assembly; 30, base body; 300, base; 301, positioning portion; 3010, second hole; 31, temperature sensing portion; 32, pressure sensing portion; 33, wiring portion; 4, fixing member; 40, first portion; 41, second portion; 42, third portion; 5, sealing gasket; 50, fifth hole. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below 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. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0042] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, at least one of which can be one, two or more, unless otherwise explicitly specified.

[0043] At present, the battery abnormality monitoring usually adopts a wire harness and a temperature measuring thermocouple, etc. The temperature measuring thermocouple is pasted on the upper surface of the top cover of the battery according to the area point density, monitors the temperature of a single battery, and realizes real-time monitoring of the abnormal condition of the battery. The disadvantages of this method are: 1. The temperature measuring monitoring structure is pasted on the outer surface of the top cover. Due to the lag of heat conduction, the temperature measuring monitoring structure cannot monitor the temperature and pressure inside the battery; 2. Since the temperature measuring structure only arranges several monitoring points according to the area, it cannot monitor the condition of each battery; 3. The temperature measuring monitoring structure is pasted on the top cover. When the battery is shaken or water vapor invades, there is a risk of falling off, failure, etc.

[0044] Therefore, with reference to FIGS. 1-8, the present application provides a battery, which aims to overcome at least one of the above-mentioned defects.

[0045] Embodiment 1:

[0046] With reference to FIGS. 1-4, the battery comprises an outer shell 1, an electrode assembly 2, a monitoring assembly 3 and a fixing member 4.

[0047] The outer shell 1 has a receiving cavity 10 and a first hole 11 communicating with the receiving cavity 10; the electrode assembly 2 is arranged in the receiving cavity 10; the monitoring assembly 3 comprises a base body 30, a temperature sensing portion 31 arranged on the base body 30 and a pressure sensing portion 32 arranged on the base body 30, at least a part of the base body 30 penetrates through the first hole 11, and the temperature sensing portion 31 and the pressure sensing portion 32 are both located in the receiving cavity 10; at least a part of the fixing member 4 penetrates through the base body 30, and the fixing member 4 connects the outer shell 1 and the base body 30 to fix the base body 30.

[0048] It should be noted that, in some embodiments, with reference to Figure 4, it can be understood that the shell 1 comprises a shell 16 and a top cover 17 connected together, the shell 16 and the top cover 17 enclose the accommodating cavity 10, and at least one of the shell 16 and the top cover 17 is provided with the first hole 11. In this embodiment, the first hole 11 is provided on the top cover 17, and the setting position of the first hole 11 can be located on one side of the pole 18 on the top cover 17. In other embodiments, the number and position of the first hole 11 can be flexibly adjusted as needed.

[0049] It can be understood that, with reference to Figures 1 to 4, the monitoring assembly 3 actually further comprises a wiring part 33 provided on the side of the base body 30 away from the pressure sensing part 32 and the temperature sensing part 31. The wiring part 33 is provided outside the accommodating cavity 10, so as to externally connect the wires of the temperature sensing part 31 and the pressure sensing part 32. The temperature sensing part 31 and the pressure sensing part 32 can adopt conventional temperature and pressure sensors, and the use principle thereof is the prior art, which will not be described here.

[0050] By respectively arranging the temperature sensing part 31 and the pressure sensing part 32 in the accommodating cavity 10, the internal temperature and pressure changes of the battery can be monitored in time, so as to improve the timeliness and accuracy of the monitoring of abnormal conditions of the battery. At the same time, by penetrating the base body 30 with the fixing part 4 and connecting the shell 1 and the base body 30, the installation stability of the monitoring assembly 3 is further improved.

[0051] In some embodiments, with reference to Figures 2 to 4, the base body 30 comprises a base part 300 and a positioning part 301 connected together, the base part 300 penetrates the first hole 11, and the positioning part 301 is connected to the side of the top cover 17 away from the electrode assembly 2. The positioning part 301 is provided with a second hole 3010, and part of the fixing part 4 penetrates the second hole 3010. The fixing part 4 connects the shell 1 and the positioning part 301.

[0052] The base body 30 as a whole can be quickly hung on the top cover 17 through the positioning part 301, and the base part 300 and the first hole 11 are matched to realize quick positioning and arrangement of the whole monitoring assembly 3, so as to improve the assembly efficiency of the monitoring assembly 3 and the top cover 17.

[0053] On this basis, in order to further improve the hanging stability and positioning accuracy of the positioning part 301, in some embodiments, with reference to Figures 2 and 4, the side of the shell 1 away from the electrode assembly 2 is provided with a first ring groove 12 surrounding the first hole 11, and the first ring groove 12 communicates with the first hole 11. The positioning part 301 surrounds the base part 300 and is embedded in the first ring groove 12.

[0054] In some embodiments, referring to FIGS. 2 and 4, the top cover 17 is provided with a third hole 13 communicating with the accommodating cavity 10, and the third hole 13 communicates with the second hole 3010. In the embodiment, the fixing member 4 includes a first portion 40, a second portion 41 and a third portion 42 connected with each other, the second portion 41 is arranged through the second hole 3010 and the third hole 13, the third portion 42 is arranged in the accommodating cavity 10, the first portion 40 is arranged on a side of the second portion 41 away from the accommodating cavity 10, and the first portion 40 and the third portion 42 clamp the positioning portion 301 and the shell 1.

[0055] It can be understood that, in the embodiment, the fixing member 4 is actually integrally injection molded, and the first portion 40, the second portion 41 and the third portion 42 are integrally formed in the injection molding process. The second portion 41 passes through the second hole 3010 and the third hole 13 and connects the first portion and the third portion 42, and after being formed, the second portion 41 and the third portion 42 clamp the top cover 17 and the base 30 on one hand to form a sealing effect between the top cover 17 and the base 30 at the first hole 11, and on the other hand to clamp the top cover 17 and the base 30, so as to realize the fixation of the whole monitoring assembly 3, and when vibration or water vapor intrusion occurs, there is no risk of falling off. It also improves the sealing effect of the first hole 11.

[0056] In order to make the clamping effect better, the third portion 42 can be designed to have a thickness greater than that of the first portion 40, and in order not to occupy the internal space of the shell 1, the third portion 42 is designed to have a thickness not greater than twice the thickness of the first portion 40.

[0057] In order to further improve the fixing effect of the fixing member 4 on the monitoring assembly 3, in some embodiments, referring to FIGS. 2 and 4, the first portion 40 and the third portion 42 are respectively arranged around the hole center of the first hole 11, and the second hole 3010 and the third hole 13 are respectively provided with a plurality of holes, and in the embodiment, the second hole 3010 and the third hole 13 are uniformly distributed around the first hole 11. Correspondingly, the second portion 41 is provided with a plurality of portions, and the plurality of second portions 41 respectively connect the first portion 40 and the third portion 42, and each second portion 41 corresponds to each second hole 3010 and each third hole 13.

[0058] The first portion 40 and the third portion 42 form a circumferential clamping around the first hole 11, which improves the sealing effect at the first hole 11 and the cladding effect on the monitoring assembly 3, and improves the fixing effect on the monitoring assembly 3.

[0059] In some embodiments, referring to FIGS. 2 and 4, the side of the top cover 17 away from the electrode assembly 2 is provided with a second ring groove 14, the second ring groove 14 surrounds the first ring groove 12, the second ring groove 14 communicates with the first ring groove 12, and at least part of the first portion 40 is embedded in the second ring groove 14.

[0060] It can be understood that the actual positioning part 301 in the embodiment is also provided with a groove structure communicating with the second ring groove 14. In the injection molding process of the first part 40, the second ring groove 14 can form a whole groove structure accommodating the first part 40, which is beneficial to limit the injection structure of the first part 40, reduce the overflow of the first part 40 injection material and improve the setting stability of the first part 40.

[0061] Correspondingly, the application provides a battery pack comprising the above battery. The battery pack can be applied to electronic devices, power storage devices, or power vehicles, and the like. It can be understood that the battery pack can have all the technical features and corresponding beneficial effects of the above battery, which will not be repeated here.

[0062] Embodiment 2:

[0063] Referring to FIGS. 5-8, the difference between the embodiment and the embodiment 1 is that the fourth hole 15 is opened in the top cover 17 towards the positioning part 301, and the fourth hole 15 communicates with the second hole 3010. The fixing part 4 can be a threaded part such as a screw. Part of the fixing part 4 is provided in the second hole 3010 and the fourth hole 15, and the fixing part 4 is threadedly connected to the top cover 17, thereby facilitating quick fixing of the base body 30.

[0064] By using the threaded fixing part 4, the overall disassembly and assembly convenience and installation stability of the monitoring assembly 3 are improved.

[0065] In addition, in order to further improve the installation stability of the monitoring assembly 3, in some embodiments, referring to FIGS. 6 and 8, a plurality of second holes 3010 and fourth holes 15 are provided, and the second holes 3010 and the fourth holes 15 are uniformly distributed around the first hole 11. Correspondingly, the fixing part 4 is provided with a plurality of fixing parts 4, each fixing part 4 corresponds to each second hole 3010 and each fourth hole 15.

[0066] In order to improve the sealing effect at the first hole 11, in some embodiments, referring to FIGS. 2 and 4, the battery further comprises a sealing gasket 5, the sealing gasket 5 is embedded in the first ring groove 12, the sealing gasket 5 surrounds the base 300, and the sealing gasket 5 is located between the positioning part 301 and the shell 1. The sealing gasket 5 is provided with a fifth hole 50 communicating with the second hole 3010 and the fourth hole 15, respectively, so as to pass through when the fixing part 4 connects the top cover 17 and the base body 30.

[0067] In addition, in some embodiments, the base body 30 and the shell 1 can also be bonded by glue or connected by welding, which is beneficial to improve the sealing effect at the first hole 11 and the fixing stability of the whole monitoring assembly 3, which will not be repeated here.

[0068] When the welding mode is adopted, the positioning part 301 is made of aluminum, aluminum alloy, stainless steel or other metal materials. The temperature sensing part 31 and the pressure sensing part 32 are made of insulating materials such as PP.

[0069] The above describes in detail a battery and a battery pack provided by the embodiments of the present application, and the principles and implementation manners of the present application are described by using specific examples. The above descriptions of the embodiments are only used to help understand the technical solutions of the present application and the core ideas thereof. It should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently. The modifications or replacements do not change the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, wherein, The battery comprises: a housing (1) having a containing cavity (10) and a first hole (11) communicating with the containing cavity (10); an electrode assembly (2) arranged in the containing cavity (10); a monitoring assembly (3) comprising a base body (30), a temperature sensing part (31) arranged on the base body (30) and a pressure sensing part (32) arranged on the base body (30), at least a part of the base body (30) penetrating through the first hole (11), and the temperature sensing part (31) and the pressure sensing part (32) being located in the containing cavity (10); a fixing member (4) penetrating through at least a part of the base body (30), and the fixing member (4) connecting the housing (1) and the base body (30) to fix the base body (30).

2. The battery according to claim 1, wherein the base body (30) comprises a base part (300) and a positioning part (301) connected with each other, the base part (300) penetrating through the first hole (11), and the positioning part (301) being connected to a side of the housing (1) away from the electrode assembly (2), the positioning part (301) being provided with a second hole (3010) penetrating through, and a part of the fixing member (4) penetrating through the second hole (3010), and the fixing member (4) connecting the housing (1) and the positioning part (301).

3. The battery according to claim 2, wherein a first annular groove (12) is arranged on a side of the housing (1) away from the electrode assembly (2), the first annular groove (12) surrounding the first hole (11) and communicating with the first hole (11); the positioning part (301) surrounds the base part (300) and is embedded in the first annular groove (12).

4. The battery according to claim 3, wherein the housing (1) is provided with a third hole (13) communicating with the containing cavity (10) and the second hole (3010); the fixing member (4) comprises a first part (40), a second part (41) and a third part (42) connected with each other, the second part (41) penetrating through the second hole (3010) and the third hole (13), the third part (42) being located in the containing cavity (10), the first part (40) being located on a side of the second part (41) away from the containing cavity (10), and the first part (40) and the third part (42) clamping the positioning part (301) and the housing (1).

5. The battery according to claim 4, wherein a plurality of the second holes (3010) and a plurality of the third holes (13) are respectively arranged, a plurality of the second parts (41) are arranged, the plurality of the second parts (41) being connected with the first part (40) and the third part (42) respectively, and each of the second parts (41) corresponds to each of the second holes (3010) and each of the third holes (13).

6. The battery of claim 4, wherein, the first portion (40) is disposed around a center of the first hole (11); and / or, the third portion (42) is disposed around the center of the first hole (11).

7. The battery of claim 6, wherein, a second annular groove (14) is provided on a side of the housing (1) facing away from the electrode assembly (2), the second annular groove (14) surrounds the first annular groove (12), the second annular groove (14) is in communication with the first annular groove (12), and at least a portion of the first portion (40) is embedded in the second annular groove (14).

8. The battery of claim 2, wherein, a fourth hole (15) is provided on the housing (1) facing the positioning portion (301), the fourth hole (15) is in communication with the second hole (3010); a portion of the fixing member (4) passes through the second hole (3010) and the fourth hole (15), and the fixing member (4) is threadedly connected to the housing (1).

9. The battery of claim 8, wherein, a plurality of second holes (3010) and a plurality of fourth holes (15) are respectively provided, and a plurality of fixing members (4) are provided, each fixing member (4) corresponds to each second hole (3010) and each fourth hole (15).

10. The battery of claim 8, wherein, a first annular groove (12) is provided on a side of the housing (1) facing away from the electrode assembly (2), the first annular groove (12) surrounds the first hole (11), the first annular groove (12) is in communication with the first hole (11), and the positioning portion (301) surrounds the base portion (300) and is embedded in the first annular groove (12); the battery further comprises a sealing gasket (5) embedded in the first annular groove (12), the sealing gasket (5) surrounds the base portion (300), the sealing gasket (5) is located between the positioning portion (301) and the housing (1), the sealing gasket (5) is provided with a fifth hole (50) in communication with the second hole (3010) and the fourth hole (15) respectively, and a portion of the fixing member (4) passes through the fifth hole (50).

11. The battery of any one of claims 1 to 10, wherein, the housing (1) comprises a shell (16) and a top cover (17) connected to each other, the shell (16) and the top cover (17) enclose the accommodation cavity (10), and at least one of the shell (16) and the top cover (17) is provided with the first hole (11).

12. The battery of claim 1, wherein, the monitoring assembly (3) further comprises a wiring portion (33) provided on a side of the base body (30) facing away from the pressure sensing portion (32) and the temperature sensing portion (31).

13. The battery of claim 4, wherein, the third portion (42) is designed to have a thickness greater than that of the first portion (40) and not greater than twice the thickness of the first portion (40).

14. A battery pack, wherein, A battery comprising the battery as claimed in any one of claims 1 to 13.

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