Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, and belongs to the technical field of batteries, in the battery pack, the battery pack comprises a box body, the box body comprises a first plate and a plurality of beams arranged on one side of the first plate, the plurality of beams are connected with the first plate and define an accommodating cavity, and the beams have first surfaces deviating from the first plate; the plurality of single batteries are arranged in the accommodating cavity; the structural adhesive is arranged in the accommodating cavity, and the beam is connected with at least part of the single batteries through the structural adhesive; a first glue injection groove and a second glue injection groove are formed in the side, facing the single battery, of at least one beam, the first glue injection groove, the second glue injection groove and the containing cavity are communicated with one another, the first glue injection groove is provided with a glue injection opening formed in the first face, and the extending direction of the second glue injection groove intersects with the first glue injection groove. The first glue injection groove is formed to provide an effective glue injection gap between the box body and the single battery, and the second glue injection groove is formed, so that the glue injection efficiency is improved, and glue overflow in the glue injection process is avoided.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery pack and electrical equipment. Background Art

[0002] In a battery pack, after the single cells are put into the box, there are gaps between some of the single cells and the beams of the box, and structural glue needs to be poured into them to ensure the reliability of the connection between the single cells and the box. However, the current structure of the battery pack makes it difficult to pour structural glue, which affects the efficiency of battery pack production. Utility Model Content

[0003] Purpose of the utility model: The embodiment of the present application provides a battery pack, aiming to solve the technical problem that it is difficult to inject glue into the battery pack; another purpose of the present application is to provide an electrical device.

[0004] Technical solution: The embodiment of the present application provides a battery pack, including:

[0005] A box body, the box body comprising a first plate and a plurality of beams arranged on one side of the first plate, the plurality of beams being connected to the first plate and surrounding a receiving cavity, the beams having a first surface facing away from the first plate;

[0006] A plurality of single cells are arranged in the accommodation cavity;

[0007] Structural adhesive, disposed in the accommodating cavity and between at least one of the beams and the single battery, respectively connecting at least one of the beams and the single battery;

[0008] At least one of the beams is provided with a first glue injection groove and a second glue injection groove on one side facing the single cell, the first glue injection groove, the second glue injection groove and the accommodating cavity are connected to each other, the first glue injection groove has a glue injection port arranged on the first surface, the extension direction of the second glue injection groove intersects with the first glue injection groove, and the structural glue is at least partially filled in the first glue injection groove and the second glue injection groove.

[0009] In some embodiments, the beam has a height direction and a length direction that intersect each other, and the first plate is disposed on one side of the beam along the height direction;

[0010] The first glue injection groove extends along the height direction, and the second glue injection groove extends along the length direction.

[0011] In some embodiments, there are multiple second glue injection grooves, and the multiple second glue injection grooves are arranged at intervals along the height direction, and the multiple second glue injection grooves are respectively connected to the first glue injection grooves.

[0012] In some embodiments, at least one of the second glue injection grooves is disposed at an end of the first glue injection groove close to the first plate.

[0013] In some embodiments, there are multiple first glue injection grooves, the multiple first glue injection grooves are arranged at intervals along the length direction, and the multiple first glue injection grooves are respectively connected to the second glue injection grooves.

[0014] In some embodiments, the beam has a height direction, and the first plate is disposed on one side of the beam along the height direction;

[0015] The dimension of the first glue injection groove along the height direction is a mm, and the dimension of the beam along the height direction is b mm; and the following is satisfied: 2 / 3≤a / b≤1.

[0016] In some embodiments, the beam further has a thickness direction, and a dimension of the first glue injection groove along the thickness direction is c1, satisfying: 1mm≤c1≤4mm; and / or,

[0017] The dimension of the second glue injection groove along the thickness direction is c2, which satisfies: 1mm≤c2≤4mm.

[0018] In some embodiments, the beam includes a first wall and a reinforcement portion connected to each other, the reinforcement portion is arranged on a side of the first wall away from the single battery, the first glue injection groove and the second glue injection groove are arranged on the first wall, and the orthographic projection of the reinforcement portion on the first wall covers the first glue injection groove and the second glue injection groove.

[0019] In some embodiments, the beam has an intersecting length direction and height direction, the beam includes a second surface facing the single battery, the first glue injection groove has a first notch disposed on the second surface, the second glue injection groove has a second notch disposed on the second surface, the size of the first notch along the length direction is d mm, and satisfies: 4≤d≤10; the second glue injection groove has an inner wall surface, the beam includes a chamfered portion, and the second surface is connected to the inner wall surface through the chamfered portion;

[0020] and / or,

[0021] The dimension of the second notch along the height direction is e mm, satisfying: 4≤e≤10.

[0022] In some embodiments, along the length direction, the spacing between adjacent first glue injection grooves is f1 mm, wherein the size of the single battery connected to the beam along the length direction of the beam is L mm, and the number of the first glue injection grooves is n, and n>1, satisfying:

[0023] Along the height direction, the spacing between adjacent second glue injection grooves is f2 mm, satisfying: 25≤f2≤45.

[0024] Correspondingly, an embodiment of the present application also provides an electrical device, including a battery pack as described in the above embodiment.

[0025] Beneficial effects: A battery pack according to an embodiment of the present application comprises: a box body, the box body comprising a first plate and a plurality of beams arranged on one side of the first plate, the plurality of beams being connected to the first plate and forming a receiving cavity, the beam having a first surface facing away from the first plate; a plurality of single cells arranged in the receiving cavity; a structural adhesive arranged in the receiving cavity, the beam being connected to at least part of the single cells through the structural adhesive; a first glue injection groove and a second glue injection groove are provided on the side of the beam facing the single cell, the first glue injection groove, the second glue injection groove and the receiving cavity are interconnected, the first glue injection groove has a glue injection port arranged on the first surface, and the extension direction of the second glue injection groove intersects with the first glue injection groove. The first glue injection groove and the glue injection port formed by the first glue injection groove on the first surface solve the problem that the gap between some single cells and the beam is too small to be smoothly injected, such as the defects of low glue injection efficiency, poor glue injection effect and easy glue overflow caused by top glue injection. The first glue injection groove satisfies the requirement of placing the glue injection structure (such as the glue injection needle) into the gap between some single cells and the beam, realizing glue injection inside the gap, improving the glue injection efficiency, ensuring the connection reliability between the beam and some single cells, and meeting the industrialization and automation production requirements of products with narrow gap structures. The second glue injection groove is arranged to intersect with the first glue injection groove, and during the process of pouring the structural glue, the flow direction of the structural glue changes from a single direction to multiple directions, further improving the glue injection efficiency, while ensuring the glue injection effect, making the flow range of the structural glue wider, and avoiding premature glue overflow.

[0026] The electric device of the embodiment of the present application includes the above-mentioned battery pack, and thus can have all the technical features and technical effects of the above-mentioned battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a schematic diagram of a top view of a battery pack in one embodiment of the present application;

[0029] Figure 2 This is a schematic diagram of the three-dimensional structure of a box in one embodiment of the present application;

[0030] Figure 3 This is a schematic diagram of the main structure of a beam in one embodiment of the present application;

[0031] Figure 4 for Figure 3 A local enlarged schematic diagram of the middle A;

[0032] Figure 5 This is a perspective schematic diagram of a beam in an embodiment of the present application from a left perspective;

[0033] Figure 6 for Figure 5 A partial enlarged schematic diagram of point B in the middle;

[0034] Figure numerals: 1, box body; 11, first plate; 12, beam; 20, single cell; 100, accommodating cavity; 120, first surface; 121, first glue injection groove; 122, second glue injection groove; 123, second surface; 124, chamfered portion; 125, reinforcement portion; 126, first wall; 1210, glue injection port; 1211, first notch; 1221, second notch; 1220, inner wall surface. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with 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 of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0036] It should also be noted that in the drawings of the embodiments of the present application, the arrow marked with X indicates the length direction of the beam, the arrow marked with Y indicates the thickness direction of the beam, and the arrow marked with Z indicates the height direction of the beam. The length direction X, the thickness direction Y, and the height direction Z are introduced to more clearly describe the structure and relative position relationship of each component in the battery assembly. In practical applications, the thickness direction X and the width direction Y may change according to the different placement of the battery pack. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, and at least one refers to one, two or more, unless otherwise clearly and specifically defined.

[0037] In the process of pouring structural adhesive into the gap between the single cell and the box, the mixed viscosity of the poured structural adhesive is about 5000cps. At present, it is difficult to pour structural adhesive into the battery pack. The poured glue flows slowly from top to bottom, the injection efficiency is low, and bubbles are easily accumulated during the injection process. Therefore, the narrow gap structure makes it impossible to industrialize and automate the production of the product, while widening the gap will cause excessive glue consumption and increase material costs.

[0038] In view of this, an embodiment of the present application provides a battery pack, aiming to solve at least one of the above-mentioned technical problems.

[0039] The battery pack of the present application is described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0040] Please combine Figure 1 , Figure 2 as well as Figure 3 As shown, a battery pack of the present application includes: a box body 1, a plurality of single cells 20 and a structural adhesive.

[0041] Specifically, the box body 1 includes a first plate 11 and a plurality of beams 12 arranged on one side of the first plate 11, the plurality of beams 12 are connected to the first plate 11 and enclose a receiving cavity 100, and the beams 12 have a first surface 120 facing away from the first plate 11; a plurality of single cells 20 are arranged in the receiving cavity 100, and are located between at least one beam 12 and the single cell 20, and are respectively connected to at least one beam 12 and the single cell 20; the structural glue is poured into the glue injection gap formed between some of the single cells 20 and the beams 12 to connect the beams 12 and some of the single cells 20, and some of the single cells 20 are arranged in the box body 1. The single cell 20 adjacent to the beam 12 in the battery 20 is ensured to be stable and reliable when assembled in the box 1 by structural adhesive; a first glue injection groove 121 and a second glue injection groove 122 are provided on one side of at least one beam 12 facing the single cell 20, the first glue injection groove 121, the second glue injection groove 122 and the accommodating cavity 100 are interconnected, the first glue injection groove 121 has a glue injection port 1210 arranged on the first surface 120, and the extension direction of the second glue injection groove 122 intersects with the first glue injection groove 121; the structural adhesive is also at least partially filled in the first glue injection groove 121 and the second glue injection groove 122.

[0042] It should be understood that the single cell 20 has multiple side surfaces, among which the side with the largest area is the large surface. In this embodiment, the beam 12 is provided with a first glue injection groove 121 and a second glue injection groove 122 on one side facing the large surface of part of the single cell 20 .

[0043] The first glue injection groove 121 and the glue injection port 1210 formed by the first glue injection groove 121 on the first surface 120 solve the problem that the glue injection gap between some single cells 20 and the beam 12 is too small to smoothly inject glue, such as low glue injection efficiency, poor glue injection effect, and easy glue overflow caused by top glue injection. The first glue injection groove 121 satisfies the requirement that the glue injection structure (such as the glue injection needle) is placed in the glue injection gap between some single cells 20 and the beam 12, so as to realize glue injection inside the glue injection gap, improve the glue injection efficiency, ensure the connection reliability between the beam 12 and some single cells 20, and meet the industrialization and automation production requirements of products with narrow gap structures. The second glue injection groove 122 is arranged to intersect with the first glue injection groove 121. In the process of pouring structural glue, the flow direction of the structural glue changes from a single direction to multiple directions, further improving the glue injection efficiency. At the same time, the glue injection effect is ensured, so that the flow range of the structural glue is wider, and premature glue overflow is avoided.

[0044] It should be understood that, in some embodiments, the beam 12 has an intersecting height direction Z and length direction X, the first plate 11 is disposed on one side of the beam 12 along the height direction Z; the first glue injection groove 121 extends along the height direction Z, and the second glue injection groove 122 extends along the length direction X. In the process of pouring the structural glue, the distribution of the first glue injection groove 121 and the second glue injection groove 122 allows the structural glue to flow from the height direction Z and then toward the length direction X, so as to ensure that the structural glue flows as far away from the glue injection port 1210 as possible, so that the structural glue is distributed more widely and evenly inside the glue injection gap, thereby ensuring the glue injection effect and avoiding premature glue overflow.

[0045] More specifically, in some embodiments, the number of the second glue injection grooves 122 is multiple (eg Figure 3 As shown, a plurality of second glue injection grooves 122 are arranged at intervals along the height direction Z, and the plurality of second glue injection grooves 122 are respectively connected to the first glue injection grooves 121. By providing a plurality of second glue injection grooves 122, more flow directions can be provided for the structural glue to further improve the glue injection efficiency. At the same time, the plurality of second glue injection grooves 122 are arranged at intervals along the height direction Z, so that the structural glue can be more evenly poured into each area inside the glue injection gap, further ensuring the reliability of the connection between some single cells 20 and the box body 1, and preventing the structural glue from failing to reach some areas within the glue injection gap, forming a cavity, and affecting the stability and reliability of the connection between the single cells 20 and the box body 1.

[0046] Ginseng Figure 3 and Figure 4As shown, in some embodiments, at least one second glue injection groove 122 is disposed at one end of the first glue injection groove 121 close to the first plate 11. By intersecting the second glue injection groove 122 at the end of the first glue injection groove 121 close to the first plate 11, the structural glue can be poured into the bottom of the glue injection gap, and at the same time, it is ensured that the poured structural glue can be evenly distributed in the area close to the bottom of the glue injection gap along the length direction, so that the space at the bottom of the glue injection gap can be quickly filled with the structural glue, avoiding the structural glue from failing to reach a partial area at the bottom of the glue injection gap, forming a local cavity, and causing an unstable connection between some single cells 20 and the box body 1.

[0047] More specifically, in some embodiments, the number of the first glue injection grooves 121 is multiple (eg Figure 3 As shown, a plurality of first glue injection grooves 121 are arranged at intervals along the length direction X, and the plurality of first glue injection grooves 121 are respectively connected to the second glue injection grooves 122. According to the length of the battery cell, a plurality of first glue injection grooves 121 are selected to be arranged correspondingly, and the glue injection gap between some single batteries 20 and the box body 1 is divided into regions in the length direction X by the first glue injection grooves 121, and more glue injection ports 1210 are provided for the glue injection structure (such as a glue injection needle) to inject glue, so as to achieve rapid glue injection, reduce the glue injection time, and ultimately improve the glue injection efficiency.

[0048] It should be understood that, in some embodiments, the beam 12 has a height direction Z, and the first plate 11 is arranged on one side of the beam 12 along its height direction Z; the dimension of the first glue injection groove 121 along the height direction Z is a mm, and the dimension of the beam 12 along the height direction Z is b mm; and the following conditions are satisfied: 2 / 3≤a / b≤1. By limiting the dimension of the first glue injection groove 121 in the height direction Z, the structural glue can be better injected into the bottom of the glue injection gap. Considering that, based on the fluid characteristics of the structural glue, the fluid is in a slit flow state, the smaller the slit gap, the slower the flow, which reduces the production efficiency and the glue filling effect, and also increases the probability of residual bubbles. Therefore, the height dimension of the first glue injection groove 121 satisfies between 2 / 3-1 of the height dimension of the beam 12, which is conducive to improving the injection speed, avoiding the failure of the structural glue at the bottom of the glue injection gap to be smoothly injected, and premature glue overflow, resulting in an unreliable connection between the box body 1 and some single cells 20. After being cured, the injected structural adhesive is not only filled between the beam 12 and the single battery 20 to connect the beam 12 and the single battery 20 , but also partially filled into the first glue injection groove 121 and the second glue injection groove 122 .

[0049] In some embodiments, the beam 12 also has a thickness direction Y, and the size of the first glue injection groove 121 along the thickness direction Y is c1, satisfying: 1mm≤c1≤4mm; the size of the second glue injection groove 122 along the thickness direction Y is c2, satisfying: 1mm≤c2≤4mm. It should be noted that c1 can be any value among 1, 2, 3, 4 or a range value between any two values. c2 can be any value among 1, 2, 3, 4 or a range value between any two values. At the same time, the sizes of c1 and c2 can be the same or different. Considering the existence of parts and assembly tolerances, the lower limit of the injection gap value between the single cell 20 and the box body 1 can reach 2mm, while the minimum needle tube size of the injection structure (such as the injection needle) is only 1.8mm, and the automatic insertion needle positioning deviation is ±1mm. Therefore, the dimension c1 of the first injection groove 121 along the thickness direction Y needs to be greater than or equal to 1mm to meet the needs of the needle tube inserted into the injection port 1210, and realize the industrialization and automation of narrow gap structural products. However, based on the fluid characteristics, the fluid is in a slit flow state. The smaller the slit gap, the slower the flow, which reduces the production efficiency and the glue filling effect, and also increases the probability of residual bubbles. In order to ensure the injection effect of the second injection groove 122, avoid the second injection groove 122 along the thickness direction Y The size is too small, affecting the flow of the structural glue, therefore, the second injection groove 122 along the thickness direction Y The size c1 also needs to be greater than or equal to 1mm. The maximum size of the first glue injection groove 121 along the thickness direction Y is 4mm, which widens the pin gap of the glue injection structure (glue injection needle), and can also ensure a minimum pin gap size of 4mm in the thickness direction Y, and the pin position of the glue injection needle is completely located in the glue injection port 1210. When the size of the first glue injection groove 121 along the thickness direction Y is larger, the glue injection efficiency is higher, and the flow speed of the structural glue in the glue injection gap is faster, avoiding the bubble accumulation problem caused by the slow flow of glue from top to bottom. When the size of the second glue injection groove 122 along the thickness direction Y is larger, the overall glue injection effect in the glue injection gap is better, and the glue injection amount distribution in each area inside the gap is more uniform. At the same time, the first glue injection groove 121 and the second glue injection groove 122 can overcome the problems of large glue consumption and high cost caused by the overall widening of the glue injection gap.

[0050] Ginseng Figure 5As shown, in some embodiments, the beam 12 includes a first wall 126 and a reinforcing portion 125 connected to each other, the reinforcing portion 125 is arranged on the side of the first wall 126 away from the single battery 20, the first glue injection groove 121 and the second glue injection groove 122 are arranged on the first wall 126, and the orthographic projection of the reinforcing portion 125 on the first wall 126 covers the first glue injection groove 121 and the second glue injection groove 122. Based on the size of the beam 12 along the thickness direction Y, after the first glue injection groove 121 and the second glue injection groove 122 are opened on the side of the beam 12 close to the single battery 20, the stress structure of the beam 12 will be affected, resulting in a reduction in rigidity, a risk of damage, and low battery safety. Therefore, by setting a thickened structure on the side of the beam 12 away from the single battery 20, the rigidity of the beam 12 is enhanced to ensure battery safety.

[0051] In some embodiments, the beam 12 has an intersecting length direction X and height direction Z, the beam 12 includes a second surface 123 facing the single battery 20, the first glue injection groove 121 has a first notch 1211 arranged on the second surface 123, the second glue injection groove 122 has a second notch 1221 arranged on the second surface 123, the size of the first notch 1211 along the length direction X is d mm, satisfying: 4≤d≤10; the size of the second notch 1221 along the height direction Z is e mm, satisfying: 4≤e≤10; d can be any value among 4, 5, 6, 7, 8, 9, 10 or a range value between any two values; e can be any value among 4, 5, 6, 7, 8, 9, 10 or a range value between any two values. Among them, the minimum size of the first slot 1211 and the second slot 1221 along the length direction X is 4mm. On the one hand, it provides a sufficient safety value for the glue injection structure (glue injection needle) insertion pin. On the other hand, the larger the size of the first slot 1211 and the second slot 1221, the faster the injected glue can flow to the glue injection gap area between adjacent first glue injection grooves 121 and between adjacent second glue injection grooves 122, thereby ensuring the glue injection effect in the glue injection gap; at the same time, the maximum size of the first slot 1211 and the second slot 1221 along the length direction X is 10mm. The purpose is to save glue injection costs and avoid excessive glue consumption.

[0052] Ginseng Figure 6As shown, in some embodiments, the second glue injection groove 122 has an inner wall surface 1220, the beam 12 includes a chamfered portion 124, and the second surface 123 is connected to the inner wall surface 1220 through the chamfered portion 124. By setting the chamfered portion 124 to transitionally connect the inner wall surface 1220 and the second surface 123, on the one hand, during the process of pouring the structural glue, the chamfered portion 124 can guide the gas in the glue injection gap to be discharged upward, avoiding the gas pressure inside the glue injection gap to affect the glue injection rate; at the same time, it can avoid the accumulation of bubbles that may be formed, resulting in poor glue injection effect; on the other hand, the chamfered portion 124 can guide the structural glue to quickly climb in the glue injection gap, so that the structural glue can be filled between adjacent second glue injection grooves 122 more quickly, so that the glue injection effect is better.

[0053] In some embodiments, along the length direction X, the spacing between adjacent first glue injection grooves 121 is f1 mm, the size of the single battery 20 connected to the beam 12 along the length direction X of the beam 12 is L mm, and the number of first glue injection grooves 121 is n, where n>1, satisfying: It should be understood that during the process of glue injection by the glue injection structure (such as glue injection needle) of the first glue injection groove 121, the glue will flow to the bottom of the first glue injection groove 121 through the extension direction of the first glue injection groove 121 and gradually fill the gap area between the beam 12 and the single battery 20 from bottom to top toward both sides of the first glue injection groove 121. Therefore, it can be understood that the spacing between adjacent first glue injection grooves 121 should not be too large or too small. The spacing between the first glue injection grooves 121 is related to the length of the beam 12 and the production cycle. The number of glue injection needles required for a single battery cell is calculated according to the production cycle, which should meet the following requirements: When the glue injection effect is ensured, it is also beneficial to avoid premature glue overflow due to the lack of glue injection in some gap areas; wherein the glue injection area formed by the first glue injection grooves 121 is fan-shaped and symmetrically distributed with the first glue injection grooves 121. Preferably, when the distribution spacing of adjacent first glue injection grooves 121 is When the required injection structure (injection needle) is met, the injection effect is relatively better while the number of required injection structures (injection needles) is minimized. The reasons are as follows: each injection needle has the same injection range k on both sides, the injection range k = L / 2n, the gap between adjacent injection needles is 2k, and 2k = f1, that is, f1 = L / n.

[0054] Specifically, when the number of the first glue injection grooves 121 is 1, the opening position of the first glue injection groove 121 is located at 1 / 2 of the length direction X of the beam 12; when the number of the first glue injection grooves 121 is 2, the opening position of the first glue injection groove 121 is located at 1 / 4 and 3 / 4 of the length direction X of the beam 12; when the number of the first glue injection grooves 121 is 3, the opening position of the first glue injection groove 121 is located at 1 / 6, 1 / 2, and 5 / 6 of the length direction X of the beam 12; and so on, when the number of the first glue injection grooves 121 is n, the opening position of the first glue injection grooves 121 in the length direction X of the beam 12 is that the spacing between adjacent first glue injection grooves 121 is L / n, and the first glue injection grooves 121 distributed at both ends of the beam 12 are respectively located at 1 / 2n and L-(1 / 2n) of the length direction X of the beam 12.

[0055] In the height direction, the spacing between adjacent second glue injection grooves 122 is f2 mm, satisfying: 25≤f2≤45. By controlling the spacing range between adjacent second glue injection grooves 122 to be between 25 mm and 45 mm, it is helpful to improve the reliability of the connection between the box body 1 beam 12 and the single battery 20, and avoid insufficient glue injection due to too large a spacing range and premature glue overflow due to too small a spacing range.

[0056] Next, multiple embodiments and comparative examples are provided to illustrate the glue injection effect of the battery pack of the present application. The structural glue is a non-Newtonian fluid, and the test conditions are as follows: "according to GB / T2794 test temperature 25°C / rotor S14 / speed 100rpm", and the mixed viscosity of the injected structural glue is about 5000cps. Among them, the dimension L mm of the single battery 20 connected to the beam 12 along the length direction X of the beam 12 is 300mm, the dimension b mm of the beam 12 along the height direction Z is 90mm, the glue injection gap is 3mm, and the number of distributions of the first glue injection groove 121 and the second glue injection groove 122 are both 2. It should be understood that the glue injection effect is determined by the glue injection flow rate cc / s and the no-overflow glue filling rate, wherein the no-overflow glue filling rate refers to the total amount of glue injected in the non-overflow state, and the total amount of glue injected can be measured by volume or mass, that is, by measuring the volume or mass of the remaining amount of glue injected, the total amount of glue used for injection in the non-overflow state is obtained. The test results of the embodiments and comparative examples are as follows:

[0057] a / b <![CDATA[c1]]> <![CDATA[c2]]> d mm e mm <![CDATA[f1 mm]]> <![CDATA[f2 mm]]> Injection flow ratecc / s No overflow filling rate Embodiment 1 2 / 3 2mm 2mm 5 5 150 25 0.8 87％ Embodiment 2 2 / 3 2mm 2mm 5 5 150 25 1.6 81％ Embodiment 3 5 / 6 2mm 2mm 5 5 150 25 0.8 91％ Embodiment 4 1 2mm 2mm 5 5 150 25 0.8 95％ Embodiment 5 1 / 3 2mm 2mm 5 5 150 25 0.8 66％ Embodiment 6 2 / 3 2mm 2mm 5 5 150 25 0.8 87％ Embodiment 7 2 / 3 3mm 3mm 5 5 150 25 0.8 87％ Embodiment 8 2 / 3 4mm 4mm 5 5 150 25 0.8 88％ Embodiment 9 2 / 3 5mm 5mm 5 5 150 25 0.8 90％ Embodiment 10 2 / 3 0.8mm 0.8mm 5 5 150 25 0.8 80％ Embodiment 11 2 / 3 2mm 2mm 4 4 150 25 0.8 85％ Embodiment 12 2 / 3 2mm 2mm 5 5 150 25 0.8 87％ Embodiment 13 2 / 3 2mm 2mm 7 7 150 25 0.8 89％ Embodiment 14 2 / 3 2mm 2mm 10 10 150 25 0.8 91％ Embodiment 15 2 / 3 2mm 2mm 11 11 150 25 0.8 94％ Embodiment 16 2 / 3 2mm 2mm 5 5 100 25 0.8 76％ Embodiment 17 2 / 3 2mm 2mm 5 5 100 35 0.8 70％ Embodiment 18 2 / 3 2mm 2mm 5 5 150 25 0.8 89％ Embodiment 19 2 / 3 2mm 2mm 5 5 150 35 0.8 87％ Embodiment 20 2 / 3 2mm 2mm 5 5 200 25 0.8 73％ Embodiment 21 2 / 3 2mm 2mm 5 5 200 35 0.8 69％ Embodiment 22 2 / 3 2mm 2mm 5 5 200 45 0.8 65％ Embodiment 23 2 / 3 2mm 2mm 5 5 50 15 0.8 63％ Embodiment 24 2 / 3 2mm 2mm 5 5 50 50 0.8 54％

[0058] As shown in the above table, in Example 1 to Example 5, a / b is controlled between 2 / 3-1, the injection flow rate is controlled at 0.8cc / s, and the no-overflow filling rate can reach more than 80%, wherein the larger a / b is, the higher the no-overflow filling rate is. It can be seen that between 2 / 3-1, the larger a / b is, the better the injection effect. When a / b is 1 / 3, the injection flow rate is controlled at 0.8cc / s, and the no-overflow filling rate is 66%. It can be seen that the amount of injection has decreased and the injection effect has become relatively worse. It should be understood that in Example 2, when a / b is 2 / 3, the injection flow rate is controlled at 1.6cc / s, and the no-overflow filling rate reaches 81%, which means that when a / b is 2 / 3, a higher injection flow rate can still obtain a better injection effect, which improves the efficiency of the injection process to a certain extent.

[0059] As shown in the above table of Example 6 to Example 10, for the convenience of comparison, c1 and c2 are set to be equal, wherein c1 and c2 are controlled between 1mm-4mm, the injection flow rate is controlled at 0.8cc / s, and the no-overflow filling rate can reach more than 80%. It can be seen that the injection effect can be guaranteed. When c1 is 5mm, the injection flow rate remains unchanged, and the no-overflow filling rate reaches 90%. Although the injection effect is better, the amount of glue used is relatively increased, the injection cost increases, and the increase of c1 and c2 will cause the structural strength of the beam 12 to decrease. However, under the premise that the injection gap is 3mm set in this application, when the values ​​of c1 and c2 are 0.8mm, the no-overflow filling rate reaches 80%, and the injection effect is slightly reduced.

[0060] As shown in the above table, in Example 11 to Example 15, d and e are both controlled between 4 and 10, the injection flow rate is controlled at 0.8cc / s, and the no-overflow filling rate can reach more than 80%. Among them, the larger the values ​​of d and e, the larger the no-overflow filling rate. It can be seen that between 4 and 10, the larger d and e are, the better the injection effect. It should be understood that the size of d and e can be the same or different. When d and e are both 11, although the no-overflow filling rate reaches 94%, the injection effect is better, but the amount of structural glue required for injection will also be larger, and the injection cost will increase.

[0061] As shown in the above table, in Example 16 to Example 24, f2=25 is controlled. When f1=L / n=150 is satisfied, the filling rate without overflowing glue is relatively good, reaching 89%, and the glue injection effect is relatively good; when f1=2L / 3n=100 is satisfied, the filling rate without overflowing glue reaches 76%, and the distance between the two adjacent first glue injection grooves 121 becomes closer. During the glue injection process, premature overflow of glue will occur in the area between the two adjacent first glue injection grooves 121, resulting in a decrease in the filling effect; when f1=4L / 3n=200 is satisfied, the filling rate without overflowing glue reaches 73%, and the distance between the two adjacent first glue injection grooves 121 becomes farther. During the glue injection process, there is a glue injection gap in the area between the two adjacent first glue injection grooves 121, resulting in a decrease in the filling effect. Similarly, when f2 is controlled to be 35 and f1 is 150, 100, and 200 respectively, the filling rates without overflowing glue are 87%, 70%, and 69% respectively. It can be seen that under the premise of f2 being unchanged and f1 being L / n, the glue injection effect is the best.

[0062] When f1=200 and f2 is controlled to be 25, 35, and 45 respectively, the filling rates without overflowing glue are 73%, 69%, and 65% respectively. It can be seen that when the value of f2 is smaller, the two second glue injection grooves 122 can be distributed close to the bottom of the glue injection gap, the diversion effect is relatively good, and the filling rate without overflowing glue is higher; and when the value of f2 is larger, it means that there is a second glue injection groove 122 distributed far away from the bottom of the glue injection gap, the diversion effect is relatively poor, and the filling rate without overflowing glue is lower.

[0063] When the value of f1 is controlled to be less than 2L / 3n and the value of f2 is less than 25 or greater than 45, the no-overflow filling rate is about 60%, the injection amount decreases, and the injection effect is relatively poor.

[0064] Accordingly, the embodiment of the present application also provides an electric device, including the battery pack as described in the above embodiment. The electric device provided in the embodiment of the present application includes the battery pack of the above embodiment, so the electric device can have all the technical features and beneficial effects of the above battery pack, which will not be repeated here.

[0065] The above is a detailed introduction to a battery pack and electrical equipment provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A box body (1), the box body (1) comprising a first plate (11) and a plurality of beams (12) arranged on one side of the first plate (11), the plurality of beams (12) being connected to the first plate (11) and enclosing a receiving cavity (100), the beams (12) having a first surface (120) facing away from the first plate (11); A plurality of single batteries (20) are arranged in an array in the accommodating cavity (100); Structural adhesive, arranged in the accommodating cavity (100) and located between at least one of the beams (12) and the single battery (20), respectively connecting at least one of the beams (12) and the single battery (20); A first glue injection groove (121) and a second glue injection groove (122) are provided on a side of at least one of the beams (12) facing the single battery (20); the first glue injection groove (121), the second glue injection groove (122) and the accommodating cavity (100) are interconnected; the first glue injection groove (121) has a glue injection port (1210) arranged on the first surface (120); the extension direction of the second glue injection groove (122) intersects with the first glue injection groove (121); and the structural glue is at least partially filled in the first glue injection groove (121) and the second glue injection groove (122).

2. The battery pack according to claim 1, characterized in that: The beam (12) has an intersecting height direction (Z) and a length direction (X), and the first plate (11) is arranged on one side of the beam (12) along the height direction (Z); The first glue injection groove (121) extends along the height direction (Z), and the second glue injection groove (122) extends along the length direction (X).

3. The battery pack according to claim 2, characterized in that: The number of the second glue injection grooves (122) is multiple, the multiple second glue injection grooves (122) are arranged at intervals along the height direction (Z), and the multiple second glue injection grooves (122) are respectively connected to the first glue injection grooves (121).

4. The battery pack according to claim 3, characterized in that: At least one of the second glue injection grooves (122) is arranged at an end of the first glue injection groove (121) close to the first plate (11).

5. The battery pack according to claim 2, characterized in that: The number of the first glue injection grooves (121) is multiple, the multiple first glue injection grooves (121) are arranged at intervals along the length direction (X), and the multiple first glue injection grooves (121) are respectively connected to the second glue injection grooves (122).

6. The battery pack according to claim 2, characterized in that: The beam (12) has a height direction (Z), and the first plate (11) is arranged on one side of the beam (12) along the height direction (Z); The dimension of the first glue injection groove (121) along the height direction (Z) is a mm, and the dimension of the beam (12) along the height direction (Z) is b mm; and the following condition is satisfied: 2 / 3≤a / b≤1.

7. The battery pack according to claim 1, characterized in that: The beam (12) further has a thickness direction (Y), and the dimension of the first glue injection groove (121) along the thickness direction (Y) is c1, satisfying: 1mm≤c1≤4mm; and / or, The dimension of the second glue injection groove (122) along the thickness direction (Y) is c2, satisfying: 1mm≤c2≤4mm.

8. The battery pack according to claim 1, characterized in that: The beam (12) comprises a first wall (126) and a reinforcement portion (125) connected to each other, the reinforcement portion (125) being arranged on a side of the first wall (126) away from the single battery (20), the first glue injection groove (121) and the second glue injection groove (122) being arranged on the first wall (126), and the orthographic projection of the reinforcement portion (125) on the first wall (126) covering the first glue injection groove (121) and the second glue injection groove (122).

9. The battery pack according to claim 1, characterized in that: The beam (12) has an intersecting length direction (X) and a height direction (Z); the beam (12) comprises a second surface (123) facing the single battery (20); the first glue injection groove (121) has a first notch (1211) arranged on the second surface (123); the second glue injection groove (122) has a second notch (1221) arranged on the second surface (123); the size of the first notch (1211) along the length direction (X) is d mm, satisfying: 4≤d≤10; the second glue injection groove (122) has an inner wall surface (1220); the beam (12) comprises a chamfered portion (124); the second surface (123) is connected to the inner wall surface (1220) via the chamfered portion (124); And / or, the dimension of the second notch (1221) along the height direction (Z) is e mm, satisfying: 4≤e≤10.

10. The battery pack according to claim 5, characterized in that: Along the length direction (X), the spacing between adjacent first glue injection grooves (121) is f1 mm, wherein the size of the single battery (20) connected to the beam (12) along the length direction (X) of the beam (12) is L mm, and the number of the first glue injection grooves (121) distributed is n, and n>1, satisfying: Along the height direction (Z), the spacing between adjacent second glue injection grooves (122) is f2 mm, satisfying: 25≤f2≤45.

11. An electrical device, characterized in that: The invention comprises a battery pack as claimed in any one of claims 1 to 10.

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